VERSATILE: Quick hand warmer & Power bank 2-in-1. It's not only a little handwarmer but also a emergency backup battery. Great gift for girls, kids, youth, boys, mens, women, ladies, elder.SAFETY & METAL HAND WARMER: Safety is top-of-mind, this mini hand warmer have built-in intelligent protection system is provided with safeguard of power on, short circuit and over loading, etc. Ensured the security of products. Shockproof, Anti-scald, Anti-skid, Explosion-proof, Radiation-free, Green and Healthy heat transfer. This small hand warmer made of premium aluminum and ABS, Eco-friendly lithium ion battery.DOUBLE SIDE HEATED & 3 DIFFERENT HEAT SETTINGS: This cool gadget heat up within seconds. There are three different temperatures [104~113℉ (40~45℃)], [113~122℉ (45~50℃)], 122~131℉ (50~55℃)], it reaches the temperature you want very quickly. 3 indicator lights keep you informed of the remaining battery and heating status.