ActionHeat 5V 3000mAh Power Bank Kit - Single AH-base-shirt They are powered by rechargeable

They are powered by rechargeable 5V batteries and can last up to 5 hours

Weather-resistant fleece & cozy fleece lining provides warmth

Medium (White): 120F - 3+ Hours

strategically placed on the chest

ActionHeat 5V 3000mAh Power Bank Kit - Single AH-base-shirt They are powered by rechargeableThe ActionHeat 3000maH batteries are super slim, sleek and powerful. They are designed specifically for all the 1 amp output ActionHeat products including 5V gloves, 5V socks, and 5V headwear. The ActionHeat batteries can be doubled as a device charger because of its unique 5V USB output. Just plug your USB cable into the battery and charge your phone, tablet, or camera. Specifications: USB output: 5 Volt 1 amp max Micro USB input: 5 Volt 1 amp input