Label:Yes It has three adjustable heating modes, precise temperature control, and intelligent thermostatic anti overheating. With the ergonomic hand warmer, you can easily and comfortably pull it ou more→t of your pocket. Made of aluminum alloy and ABS materials, smooth, warm, portable, compact and non-slip with one hand. In addition to warming your hands, it can also be used as a backup battery for mobile phones, to charge your phone in an emergency. Ideal for arthritis patients who need hyperthermia. Also suitable for hiking, camping, mountaineering in the winter. Specifications: Material: ABS, Aluminum Alloy, Electronic Components Rated Power: 4.5W Battery Capacity: 4000mAh, 10000mAh