Control your heating products conveniently from your smartphone using the free app. Whether it be heat vests, socks, gloves, vests, pant or soles - with the Lenz heat app, the heat setting of the lithium packs can be regulated quickly and without complications. Additionally, it provides an overview of the current charge level of all the lithium packs. This is perfect if the heating product is under several layers of clothes. Advantages of the app: EACH LITHIUM PACK CAN BE CONTROLLED SEPARATELY