SPECIALLY DESIGNED BATTERY FOR HEATED VEST: 7.4V 3A power bank is specially designed for heated vests, heated jackets, heated pants and other heated device. The heated vest battery has two output ports, 7.4V DC and USB, and is compatible with most 7.4v heated clothing on the market.Professionally customized batteries provide continuous and stable output for heated clothes, which is safe and reliable(Note: Compatible with ORORO and Venustas heated clothing, No suit for 5V Heated Device) SMALL SIZE, LARGE CAPACITY: The large-capacity heated vest battery of 20000mAh can continuously provide current for the heated vest for 7-14hours (high temperature for 7 hours, medium temperature for 11 hours, and low temperature for 14 hours). The battery pack for heated vest can charge smartphone 2 times. Battery pack for heated jacket can be taken on a plane and is perfect for traveling 2 DC ADAPTERS: The DC interface model of the battery is: 4.0 mm. To accommodate your heated clothing, we provide a 4.0mm to 3.5mm and 3.8mm DC adapter. If the DC output port model of your heated clothes is 4.0mm(like ORORO heated clothing), there is no need to use a DC adapter. But if the DC output port model of your heated clothes is 3.5mm/3.8mm, then you need to use a DC adapter All VESTS, ONE POWER: With the included 2 adapters, it works perfectly with the vast majority of 7.4V heated vest on the market. Such as: Compatible with Ororo, for TODWARM, for OCQOCQ, for Topdot, for Glaais, for ARRIS, for Sevdiea