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Pros

  • One of the most powerful bullet vibrators I've tested
  • Has a wide range of power for such a strong bullet - including a medium starting level which will be comfortable for most. No bullet vibrator I've tested with comparable strength, begins more gently than this one.
  • Easy to use and comfortable solo use or during sex
  • A long battery life of 85 minutes on its highest setting
  • Waterproof and easy to clean

Cons

  • Has no very gentle power levels. Some may need milder stimulation while warming up
  • Only the lowest power level is rumbly. Whether you enjoy rumbliness or buzziness is a personal preference. If you like rumbliness more, consider the We-Vibe Tango X.

Table of Contents

FemmeFunn Booster Bullet with other bullet and mini vibrators in background

The FemmeFunn Booster Bullet is a mid-budget bullet vibrator. It’s the upgraded version of the FemmeFunn Ultra Bullet. The main upgrades are a slightly stronger motor, an additional Boost button that instantly jumps to its highest power, and it comes with a storage case. You can charge the Booster Bullet directly in the storage case too. Like the Ultra, the Booster Bullet has 3 intensity levels, 17 vibration patterns, and a memory function to pick back up where you left off.

Compare Bullet & Mini Vibrators

Want to only see products that fit your needs and budget? Filter this table by performance and price using our comparison table tool here.

The FemmeFunn Booster Bullet is a good mid-budget option. It’s more powerful than most bullet vibrators, with a wide frequency range from rumbly to buzzy. And I find its 4.3-inch length and flexible core are ideal during sex. I like the FemmeFunn Booster’s top two buzzy settings, but if you prefer rumbly vibrations or need several mild settings, the We-Vibe Tango X is a better fit for you. If you’re willing to trade off a little vibration power and the booster button, the FemmeFunn Ultra Bullet is also very similar and slightly cheaper.

See all our recommendations for the best bullet and mini vibrators here.


Vibrations: Power And Range


Max Power Rating: 9.8
Power Range Rating: 7.6
Power vs Frequency Graph: 
How Strong Is Each Power? 

The FemmeFunn Booster Bullet is one of my strongest bullet vibrators and has a good range between low and high. 

I don’t consider many bullet vibrators’ top strength “extreme,” but the Booster Bullet is one I do. 

FemmeFunn Booster Bullet and FemmeFunn Ultra Bullet
The FemmeFunn Booster Bullet (left) is about 5% stronger than the less expensive Femmefunn Ultra Bullet (right)

It reaches a 9.5 out of 10 on its top power level. I never need to use this setting because even the second level is intense. The Booster Bullet has about 5% more power than the cheaper FemmeFunn Ultra Bullet – though the Ultra’s 9 out of 10 top power is strong enough for most people. Depending on your budget, it might be worth saving the $20 going with the Ultra Bullet for the minimal difference.

There are better choices than the FemmeFunn Booster Bullet for those who need mild stimulation. Its lowest power is 4.75 out of 10 strength – it begins with a fair amount of power. If you need more gentle settings consider the Lovense Ambi or BMS Swan Maximum if you like buzzy vibrations. Or the We-Vibe Tango X if you prefer rumbly vibrations.

FemmeFunn Booster Bullet with Lovense Ambi and We-Vibe Tango X
The FemmeFunn Booster Bullet (left) with alternatives that have more power levels in the mild range – the Lovense Ambi (middle) and We-Vibe Tango X (right

As someone who enjoys moderate to intense vibrations but nothing too extreme, I find the Booster Bullet’s starting level perfect as a warm-up. I spend a lot of time with it because you can vary how intense it feels by applying more or less pressure. Or by changing how direct the stimulation is on your clit.

Then, when I switch to the second power level, I’m ready for its strength and don’t find it overwhelming. This setting is around my ideal strength to finish.


Vibrations: Frequency (Rumbliness)


Rumbliness Rating: 6.2
Power vs Frequency Graph: 
Frequency on Low Power: 71 Hz (Moderately Rumbly)
Median Frequency: 102 Hz (Moderately Buzzy)
Frequency on High Power: 116 Hz (Extremely Buzzy)
Rumbliness & Power Balance: 7.3

We rate rumbly vibrators higher than buzzy ones because it’s what most people prefer. But others prefer buzzy vibrators, so go with what you like! 

The FemmeFunn Booster Bullet is buzzy. Only the lowest power level is in the rumbly range. The two highest settings are moderately and extremely buzzy. This buzziness makes the already powerful vibrations feel even more intense.

I personally enjoy the Booster Bullet’s buzzy vibrations – it’s one of my favorites. But those who want deep, rumbly vibrations will want to go with the We-Vibe Tango X instead. It’s the most rumbly bullet I’ve tried. Although not quite as strong as the Booster Bullet, it will be enough strength for many people. 

FemmeFunn Booster Bullet and We-Vibe Tango X
The FemmeFunn Booster Bullet (left) with a more rumbly alternative, the We-Vibe Tango X (right)

Vibrations typically become buzzier the stronger they get. None of the bullets I’ve tested that have extreme strength like the FemmeFunn Booster Bullet are rumbly. So consider whether you value rumbliness or intensity more.


Stimulation Precision


Stimulation Precision: Medium
FemmeFunn Booster Bullet Typical Tip Width Photo
Head or Tip Width: 0.94 inches
Tip Shape: Rounded

The FemmeFunn Booster Bullet is neither broad nor particularly focused – it’s a happy medium. The relatively wide tip (nearly an inch) is broader than many bullets with a typical lipstick or tapered shape. And it’s rounded, making it feel broader too. This makes it comfortable for firm pressure because it’s more evenly distributing that weight instead of feeling pokey.

Bullet Vibrator Tip Precision Levels
Examples of different stimulation precision levels

But it’s still narrower than several bullets and other mini vibrators like the We-Vibe Touch X. The tip is small enough to isolate vibrations to a reasonably small area, or you can use the side of the bullet to spread that out and cover a bit more space.


Comfort & Ease of Use


Comfort & Ease of Use Rating: 8.3
FemmeFunn Booster Bullet Comfort and Ease of Use Photo
Grip Comfort: 8.0
Controls: 8.5
Easy Leverage & Pressure: 8.5

The FemmeFunn Booster Bullet is very comfortable, and the buttons provide good control.

The length is excellent for maneuvering without taking up too much space or cramping your fingers. The form is flexible, which makes it comfortable to press against your body. This flexibility means you need to shift your fingers and use them to press closer to the tip if you want extra-firm pressure rather than leveraging it from the base as you would with a rigid bullet.

Using Fingers to Apply More Pressure with FemmeFunn Booster Bullet
Since the Booster Bullet has a flexible core, you can use your fingers to press when you want extra firm pressure

The vibrations travel into your fingers a bit when using them to press near the tip (where the motor is located) for extra pressure, but it’s nothing too distracting.

You cycle through the 3 intensity levels and 17 patterns using a single button on the bullet’s base. This is less convenient than bullets that let you toggle forward and backward with separate buttons, like the We-Vibe Tango X. Still, the Booster Bullet is more advanced than other cycling bullets because of the Boost button and memory system.

FemmeFunn Booster Bullet Control Buttons
The FemmeFunn Booster Bullet’s control system – cycle through with “FF” button and press the “bolt” icon for a quick burst of power

The Boost button lets you quickly jump from wherever you are in the cycle to the top steady intensity level. So basically, whenever you’re on the edge, tap the Boost button to take you the rest of the way. In addition to the slight power increase, the Boost button is this bullet’s other upgrade over the FemmeFunn Ultra Bullet. If it doesn’t seem worthwhile to you, you can save some money and get the Ultra.

The Booster Bullet also has a built-in memory system (as does the Ultra Bullet). The next time you use the bullet, it will pick up at your most recent setting. That way, if you have a favorite setting, you won’t need to cycle through all the patterns to find it again. 

And for those who prefer warming up on the gentlest setting, the next click of the button will take you directly to the lowest constant power level.


Use During Sex


Use During Sex Rating: 10.0
FemmeFunn Booster Bullet Maneuverability in a Tight Space Photo
Spooning: 10.0
Missionary: 10.0

This bullet works amazingly well during sex. It’s a great size to slip into tight spaces without taking up much room or bumping against your partner. Its round tip and flexible form make it especially comfortable, even with heavy movement during sex. It flexes with your body to remain in comfortable contact with your clit (directly or indirectly). 

Flexing the FemmeFunn Booster Bullet
The flexible form keeps the FemmeFunn Booster Bullet very comfortable during sex

It’s also a reasonably long bullet, so I don’t need to keep my hands too far down during sex.


Noise


Noise Rating: 8.1
Audibility Behind Closed Door: 8.0
Decibels on High Power: 43.7 dB
Decibels on Low Power: 39.8 dB
Low Power: Inaudible
Middle Power: Inaudible
High Power: Audible
High Power with Box Fan: Inaudible
High Power with Music: Inaudible

The FemmeFunn Booster Bullet has good, quiet noise levels. Our decibel readings were lower than the average bullet – this is especially impressive considering it’s one of the most powerful I’ve tested.

We also test whether someone would hear the bullet on the other side of a closed door. My partner stands directly on the other side of the door while I use the bullet in the bedroom.

The first two power levels were completely inaudible, but my partner could just barely hear it on the highest setting. This is the note he left in our testing spreadsheet word for word:

“This was just barely perceptible on high. I had to try really hard and wait for sounds outside to become extremely quiet. I doubt anyone would actually hear in typical use.”

Turning on a box fan or music solves this problem completely, so you can use this to mask the noise if you want to use all power levels.


Battery Life


Battery Life Rating: 7.3
FemmeFunn Booster Bullet Charging Cable Photo
Battery Life on High Power: 85 Minutes
Power Source: Rechargeable
Charging Cable: Magnetic

The FemmeFunn Booster Bullet is rechargeable and lasted 85 minutes on high power during our testing. It has the longest battery life of my “extremely powerful” bullets. And if you also use the lower or middle powers occasionally, you’ll prolong the lifespan even more.


Build Quality


Build Quality Rating: 8.5
FemmeFunn Booster Bullet Build Quality Photo

The FemmeFunn Booster Bullet has excellent build quality. The body-safe silicone is smooth and comfortable. The ABS Plastic housing the motor also feels solid. It has some good weight, making it feel more durable than cheap, lightweight bullets. The silicone buttons also feel well-made. 

The flexible part is a little squeaky, which is not as luxurious as I would hope, but it hasn’t caused me any issues. I’m comfortable applying firm pressure without worrying about damaging the bullet.


Cleaning


Cleaning Rating: 10.0
FemmeFunn Booster Bullet Waterproof Rating Demonstration
Waterproof Rating: IPX7

Since the Booster Bullet is entirely waterproof, it’s very easy to clean. You can completely submerge it while scrubbing it with soap and water. No worrying about damaging the toy.


General Design And Specs


Size and Weight:
FemmeFunn Booster Bullet Vibrator Length Measurement with Calipers Photo
Length: 4.3 inches
FemmeFunn Booster Bullet Typical Tip Width Photo
Head or Tip Width: 0.94 inches
FemmeFunn Booster Bullet Weight Measured on a Scale Photo
Weight: 2.3 ounces
Design:
FemmeFunn Booster Bullet Vibrator Shape Photo
Vibrator Shape: Straight
FemmeFunn Booster Bullet Tip Shape Photo
Head or Tip Shape: Rounded
Head or Tip Firmness: Firm
FemmeFunn Booster Bullet Rigidity and Flexibility Photo
Flexibility: Moderately Flexible
Materials: Silicone

Review Results

The FemmeFunn Booster is an excellent bullet for those who prefer mid-strength to extremely powerful, buzzy vibrations. It’s one of my favorites since I enjoy high-quality buzzy vibrations.

FemmeFunn Booster Bullet On Table with Case

If you don’t care about the roughly 5% increase in vibration power or the Boost button to quickly jump to the highest setting, you’ll be just as happy with the FemmeFunn Ultra Bullet (it’s about $20 cheaper). Apart from those two differences, it’s nearly identical.

This bullet vibrator isn’t for those needing mild stimulation or rumbly vibrations. If that’s your preference, consider one of the alternatives below. On the other hand, if you enjoy buzziness and intensity – the Booster Bullet is an excellent choice.


Compare Alternatives


Lovense Ambi

FemmeFunn Booster Bullet and Lovense Ambi

The Lovense Ambi is a better option than the FemmeFunn Booster Bullet if you need more mild settings but still enjoy some intense and buzzy upper levels. When controlling the Ambi in the Lovense app, you can access 20 intensity levels beginning much softer at a 1.5 out of 10 vibration strength. And with 20 levels, you can make tiny adjustments to the vibration strength. To use all its settings, you’ll need to control it in the app. You’ll only have 3 levels, just like the Booster Bullet, using the Ambi’s on-toy button.

The Ambi is less expensive and has a wider frequency range, too – beginning rumbly, climbing through the neutral range, and finishing moderately buzzy. It’s not as intense though – finishing at 8.0 out of 10 strength compared to the FemmeFunn Booster’s 9.5 strength. 

We-Vibe Tango X

FemmeFunn Booster Bullet and We-Vibe Tango X

The We-Vibe Tango X is better than the FemmeFunn Booster Bullet for those who need milder vibrations or prefer rumbly vibrations. This is the most rumbly bullet vibrator I own – especially for the strength it reaches. The Tango X reaches a 7.75 out of 10 on high. Not quite as strong as the Booster Bullet, but it is plenty for most people. 

The Tango X’s control system is better than the Booster Bullet’s. It has separate buttons to move through vibration patterns and increase or decrease power.  

Both bullets cost about the same. If you prefer rumbly vibrations or need especially gentle warmup levels, go with the Tango X. If you prefer buzzy vibrations or extreme intensity, go with the Booster Bullet.

FemmeFunn Ultra Bullet

FemmeFunn Booster Bullet and FemmeFunn Ultra Bullet

The FemmeFunn Ultra Bullet is best if you want to save a bit of money but still enjoy intense buzzy vibrations. The Ultra Bullet has two main differences:

  • It’s about 5% less powerful (most people won’t even notice a difference)
  • It does not have the Boost button, so you must cycle up to the top power rather than jump there instantly.

Apart from these two differences, they’re basically the same bullet. The differences are small enough that I think most people should save the $20 and get the FemmeFunn Ultra Bullet instead.

Review Updates

  • May 14, 2024: We tested the BMS Swan Maximum and added relevant comparisons in this review.
  • April 15, 2024: Review Published.

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