This rechargeable hand warmer with maximum energy and offers up to 6-12 hours of warmth. Longer battery life than other handwarmers. No more cold hands, our double-sided hand warmer quickly heats up to 95 degree only 3 second. Low temp: 95-108 degree, Medium temp:108-118 degree, High temp:118-131degree for choice by your like. This hot handwarmer is your warm companion in cold winter. To get the hand heater full recharge in just 4-5 hours with the 18W USB C wall Charger or micro-USB QC charges. No more longtime wait. No longer worry about battery life span.