Features - Color: Black - Size: 12.5 x 8 x 8cm - Material: Neoprene - Voltage: DC 5V - Current: 2A - Power: 10W - Temperature: 104/ 40 - 5V universal car mini linear temperature programmer. Easy to operate. - Good expansibility, it can stretch to fit baby feed with diameter between 50mm~80mm. - Automatic overheating protection function, after 15 -minute heating, the heater will keep constant temperature of 40, 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 travel 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 How to use Put the heating case with liquid into the mini linear temperature programmer, then plug the provided car adapter into the 5V car-mounted cigarette lighter directly. WARM TIPS - Don't pour liquid into the inside of the mini linear temperature programmer to avoid short circuit , outbreak 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.