ANTOGOO Cool-Sun Wireless Earbud, Coolsun Bluetooth Headphone, Mini in-Ear Headset Sports Earphone with Mic for All Smartphones 7500 mAh battery capacity; charges your mobile devices 3-4 times, or provides heating for 4 hours. Smart temperature detecting system: device automatically stops heating when surface temperature reaches 122F-heating stops after an hour to save battery. Device can be charged and discharged simultaneously. 2A input fast charge, works great with the SunJack panel To protect your safety and the device, it has temperature protection, over charge and discharge protection, short-circuit protection, over current protection, over voltage protection and over wattage protection. One year hassle free warranty