USB battery, it can be quickly fully charged within 2 hours, it is very safe and eco-friendly, easy to use. The inside of the cup is made of food grade 304 stainless steel, which is rust resistant and durable. We use double vacuum insulation technology of the inner and outer cup tank, which will not leak and burn your hands. Adopts fixed rotor design. When adding boiling water or turning, the rotor will not deviate from the center, which avoids the risk of accidental eating. Anti-slip bottom design, can be firmly placed on the table, sealed cup lid, not easy to leak. Perfect for mixing coffee, tea, hot chocolate, milk, protein shakes, lemonade, broth and many other light mixed drinks. - Inner mesh panties Capacity: 400ml Material: PP stainless steel Colour white Rated voltage: 5 V/1 A Rated Power: 2W Package includes: 1x Electric Self-Mixing Cup 1x Magnetic Charging Cable 1X INSTRUCTION MANUAL