NU Sensuelle Remote Control 15 Function Bullet USB Rechargeable Cock Ring is amazingly powerful, yet discreet and quiet. 15 functions. USB rechargeable bullet. USB rechargeable remote control. Charge time 1 hour. Running time 40 to 60 minutes. Bullet vibrator material ABS plastic. Cock ring material SEBS silicone. Waterproof vibrating cock ring. 1 year warranty.