Features： 1、Adjustable Temperature Heating Pouch: Designed for autumn and winter outdoor activities such as camping, skiing and mountaineering, adjustable temperature heating pouch provide you with warm and comfortable hand protection. 2、Built in USB Interface: Can be connected to the mobile power or computer for heating, convenient and practical, to provide you with convenience. 3、Unique Design: The pouches are waterproof, windproof and breathable to cope with different weather conditions and active environments. 4、Polyester Material: Made of high grade polyester material, the pouches are durable and comfortable, delicate touch, and do not affect hand flexibility. 5、Multi Functional Design: The pouch comes with a charging indicator and temperature controller to adjust the temperature to meet individual needs. Specification： Item Type: Portable Handwarmers Pouch Material: Polyester Cuff Stretch Size: 40 x 19cm/15.7 x 7.5in Zipper Length: 19.5cm/7.6inch Package List： 1 x Handwarmers Pouch 1 x Instructions