The Invincible has a super powerful 10 speed new generation F1 motor that accommodates any woman's shape and is perfectly shaped to create the most intense orgasm ever experienced. The Invincible has a rechargeable battery with a magnetic USB charging port and included charger. When fully charged it will last for 60 min. The Irresistible Collection is the ideal combination of cutting-edge technology, high-quality, aesthetics and ergonomic design. The Technology works by gently and indirectly, stimulating the clitoris with 11 different intensity levels ranging from super-soft to powerful. This beautifully designed toys encircles your clitoris without touching it and stimulates it via soft pressure air waves which creates a unique tissue penetrating vibration that cannot be achieved without the use of this technology. The average propagation speed for sound in body tissue is 1540 m/s, the speed of sound also varies by the medium it travels through. With the creation of our Touchless Airwave Technology, we are able to create the perfect sound wave pulsation which can travel through tissue and stimulate the clitoral nerve endings producing the most profound orgasms you will ever experience.Unlike other vibrators which can irritate or desensitize your clitoris by overstimulation. The Irresistible Collection is not subject to overstimulation due to its Touchless Air Wave Technology.VibrationThe Invincible (IRR003) and Mythical (IRR004) will make you tremble with pleasure with its worldwide patent pending technology which creates a touch-less sucking sensation on your clitoris via sonic pulse waves and combining it with its super powerful new generation F1 motor with 10 vibration patterns that accommodates any woman's shape to create the most intense orgasm ever experienced. It also contains a medical grade hygienic sealed membrane to protect you from fluids running down into the toys mechanism.