The product is a USB thermostat bottle warmer that provides heating for your baby's milk during outing or driving.In case of power failure, you can continue to keep the bottle constant for 2 hours. Features: 1. In case of power failure, you can continue to keep the bottle warm constant for 2 hours. 2. Multi-mode heating: car charger, USB charging treasure (2-5V), Direct charging. 3. Large capacity,can put 2 bottles without handle in it. 4. PP material: durable. 5. Portable design, easy to carry, external socket, plug and play. specification: Condition: 100% brand new Size:(approx) 21cm*12cm*8cm/8.26*4.72*3.14inch Weight:120g Material: PP + silica gel + stainless steel soft rubber Applicable people: 0-2 years old Applicable occasions: going out, long-distance travel, Applicable season: spring, summer, autumn and winter Package list: 1 *USB Baby Bottle Warmer notice: 1. Please allow slight deviation for the color and measurement. Thanks for your understanding.