The Irresistible Invincible has a rechargeable battery with a magnetic USB charging port and charger included. When fully charged it will last for 60 min. The Invincible is 100% waterproof – so that means you can go back to using your shower head for what it was made for. It’s soft to the touch smooth and waterproof design is made from medical grade silicone making iteasy to clean. Using Touchless Air Wave Technology, the Invincible offers 11 suction modes, 10 vibration modes and 3 speeds from its two motors.