ELECTRIC MIXING CUP: Easily stir a variety of drinks, like stirring coffee, milk, hot chocolate, protein powder, tea, cocoa, juices, granules, brown sugar water, lemonades and many other mixed beverages that can be stirred. Note: Viscous beverages are not applicable. NO NEED TO CHARGE: Size: 145 * 105 * 88mm, capacity 400ml, power 1w, 7000 rpm, need 2 AA batteries for power supply, IP67 waterproof. HIGH-QUALITY MATERIALS: Mixing mug made of high borosilicate glass and high quality wood imitation plastic, easy to deal with changes in cold and heat, no bursting in sudden cooling and sudden heating, low temperature resistance -30, high temperature resistance 150. HOW TO INSTALL THE BATTERY: To remove the battery cover, pull out the orange clip on the edge of the cover, then hold the cover with both hands and twist it counterclockwise to install the battery. To install the battery cover, please align the battery compartment cover with the buckle position of the imitation wood plastic cover, tighten it clockwise, and then insert the orange buckle. EASY TO CLEAN: Auto self mixing glass mugs are easy to clean, just wash with tap water. Easy to clean dirt, not easy to breed bacteria, healthy and hygiene.