MULTI-FUNCTION: Hand warmers and power bank. 2 in 1.FAST HEATING: Adjustable,a double-sided and 3 heating mode, 107F(42C)/118F(48)/131F(55C). Fast heating up in 3 seconds,EASY TO CARRY: With a pebble shaped design and mini size which makes it convenient to carry it to anywhere.LONG LASTING HEAT: Working time up to 8 hours.GREAT POWERBANK: With a large capacity of 2500mAh phone charge function. It can give full charge to Phone Samsung and other Android phone. 3 indicator light to show the battery condition.HIGH QUALITY & SAFE: The hand warmers are made of premium quality ABS material,eco-friendly polymer battery. It is reusable and safe.