The toy came packaged with a sticker on the bottom--totally impossible to read against the red of the bullet. I peeled it off and it instructed me to, "Unscrew cap and remove insulator." Oh, that would be why my bullet wasn't working. Once I had that removed, the bullet was easy to control.
The bullet's on/off switch is located at the bottom of the toy; just push it once to start the vibrations, and push it again to change the pattern/intensity.
The seven patterns are:
-low vibration
-medium vibration
-high vibration
-slow pulses, intense pulses
-a rev
-quicker, weaker pulses,
-a quicker rev
To turn the bullet off, just push down on the on/off switch.
The Ammunition is also waterproof, with an O-Ring to lock out pesky water that could trash your toy. I tested it and it passed with flying colours, so swim on.
The vibrations are a higher frequency, so they're more buzzy. They are lower strength, even on their highest setting, but if high frequency vibrations work for you, this can suffice as a warm-up toy or a main event vibrator if you don't need super strong vibrations. The vibrations are very quiet, even on the highest setting.