The item is a 5V vehicle-mounted mini linear bottle warmer heater which is suitable for bottles with diameter between 50mm~80mm. It is easy to operate and can be used to warm coffee, water, milk, juice, etc. With the constant of 40 degree centigrade, it can keep the milk warm all the time. With portable design and easy to use, it is really a wonderful gadget for use. Features - Color: Black - Size: 12.5 x 8cm - Material: Neoprene - Voltage: 5V - : 2A - Power: 10W - : 104 fahrenheit scale/ 40 degree centigrade - 5V car mini linear programmer. Easy to operate. - Made of carbon fiber heating material, warms quickly and evenly. - Good expansibility, it can stretch to fit feed with diameter between 50mm~80mm. - Automatic overheating protection function, after 15 -minute heating, the heater will keep constant of 40 degree centigrade, it can keep the milk warm all the time for safe use. - It is easy to operate and can be used to warm coffee, water, milk, juice, etc. - With a hook for easy carrying. It is really a wonderful gadget for use. - Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand! Thank you! How to use Put the heating case with liquid into the mini linear programmer, then plug the provided car into the 5V car-mounted lighter directly. WARM TIPS - Don't pour liquid into the inside of the mini linear programmer to avoid short circuit , of fire. - Only using 5V car voltage, otherwise it will burnning. - Don't use when cover when bottle is empty or liquid lower than 10% capacity. Package list: 1 x Bottle Warmer Heater