... heater realease far infrared 3)warm fast ITEM :rechargable battery heating gloveheating gloves with electic far infrared carbon ... battery, Votage: 3.7V/7.4V, Capacity: 2200mAh/4400mAh, can recycle charge-discharge for more than 500 times. It can keep warm ... for 4-10 hours, and maintain the temperature about 38-50cStylish : battery heated gloves,rechargable battery heating glove