'The Backyard Expressions Luxury Heated Sofa Folding Chair is an amazing choice for all your activities. Made with comfort in mind, and seating for two, this chair features a USB - powered heating technology with two heating zones, one in the back an done in the seat for your added comfort. Built on a durable steel frame with plush padding and comfort and two built in cup holders you will be able to relax and stay warm at any outdoor activity. Works with any USB battery pack (not included) and lasts for hours. Simply plug the cable into the USB port of your battery and start feeling the warmth. Storage pocket was added for your battery pack to keep it handy, safe and accessible.