Specification Name: Rechargeable wireless milk warmer Material: ABS+cloth cover Color: white Product Size: 8.7x5.5x14.5cm / 3.43x2.17x5.71in Charging time: 4.5 hours Battery life: approx. 3 hours Battery capacity: 5200mAh Power: 10V Voltage: 5V Constant temperature 42 ℃ (temperature difference ± 2 ℃), suitable for bottle diameter s6.5cm, to keep warm DESCRIPTION QUALITY MATERIAL: The insulation sleeve is made of high quality insulation material, which can effectively maintain the temperature of the bottle and ensure that the milk your baby drinks is at the right temperature, safe and reliable 6-speed temperature adjustment: the insulated sleeve is equipped with 6-speed temperature adjustment function, you can choose the right temperature according to different needs. PORTABLE: We offer an innovative solution for busy parents to experience convenience like never before. Powered by rechargeable batteries, the Portable Bottle Warmer is a small and portable bottle warmer designed to provide warmth without the need for bulky cords or outlets. It is versatile and can be easily adjusted to fit most bottle shapes and sizes. LONG LIFE: Our portable bottle warmer has a 5200 mAh battery capacity and can last up to 5 hours on a single full depending on the use of each heated bottle. Versatile: easily adapts to bottles up to 6.5 cm in diameter. The Portable Bottle Warmer varies depending on the number of ounces in the bottle, but can take as little as 3-5 minutes. Simply select the desired bottle temperature and wait until the bottle reaches the selected temperature. Product List 1*Bottle Warmer 1*usb cable 1*Instruction manual