Model Number: Alf-HT321-01 Brand Name: Aoolif Key Specifications/Special Features: Product details: Product nameUSB hand warmer Materials abs plastic + aluminum Battery cell Li-ion battery, 18650*2 pieces Battery Capacity 4400mAh Interface micro USB, USB 2.0 Input 5V/1A (max) Output 5V/1A (max) Dimensions 88*60*27mm Functions hand warmer, power bank, led torch Heating Temperature 47±2℃ Heating Time 3-5 hours Colors silver, pink, black, blue, green and OEM Certifications RoHS Directive-compliant, FC, CE, BSCI, ISO 9001 Guarantee 1 year