5V2A Battery Pack Special for Heated VestsSmall size and large capacity, compatible with most heated devices (heated jackets for men, heating vests, and pants) on the market, and suitable for charging smart phones. Note: This is 5v 2a heated vest battery pack. No DC output, not suit for 7.4v heated clothing. Multiple safety protection We adopt the latest version of the intelligent chip and high-quality Li-polymer. Its conversion rate is 30% higher than its predecessor and it can protect your devices against overvoltage, excessive current, overcharging, and short circuit, so as to ensure your safety in use. Plug in for Automatic Starting up It was specially designed for heated clothing. When you wear heated clothing, it is inconvenient to replace the battery. With our products, you do not need to press the switch button because it will be power on as soon as the battery was connected. It will sleep automatically when it is not working. Small Size, Large CapacityWith a highe