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Battery specifications: Model number: CN-7440B Voltage: 7.4 V Capacity: 4400 mAh Material: Lithium Input: DC 8.4 V 1.0 - 1.2 A Output: MAX 25 WHow to connect the power: The coat has a special Built-in battery pocket, where you can take out the DC power connector and plug it to the battery. Finally put them into the pocket. Operating instructions: 1.To turn on the power switch, Long press 3 seconds to boot and then, and you can see red LED light.(It's in high temperature status now) 2.About 5 minutes later, it turns automatically to blue LED light. (It's in medium temperature status now) 3.Different temperature status will be shown when you push the power button quickly,will rise to 55°C (red LED light) on high mode, 45°C (blue LED light) on medium mode,and 38°C (green LED light) on low mode. 4.To turn off,press and hold the power button until the LEDS turn off (about 3 seconds). Cleaning instruction: Disconnect and remove battery pack from battery holder pocket before washing. Put the power cable into the pocket and zip up. Tips:Charging about 5 hours, the charger's red light turns green means full now.,which means full electric power of battery. Packaging list included: 1x Heating apparel 1x Battery 1x Battery charger1x Instruction manual Notice: If you feel unconfortable when wearing the jacket,Please take off the power supply and contact us about the issues.