Rechargeable with any USB device or charger. Explore the essence of luxury with Serenity .Ergonomically designed for versatile use. 8 powerful functions of vibration, pulsation, and escalation. Auto off feature. Sure-grip design. EZ touch Silicone push button with LED power indicator. 1, 5 hour quick charge. Magnetic cover removes easily to reveal a securely covered USB port for charging. USB charging cord included. ABS with PU Cote (massager) Silicone (button). 4.5 x 1.75/11.5 cm x 4.5 cm.