Model Number: Alf-HT509 Brand Name: Aoolif Key Specifications/Special Features: Prodcut details: Product nameUSB hand warmer model HT509 Materials ABS plastic + aluminum Battery cell Li-ion battery, 18650*2 pieces Low Temperature 41-45 degree HighTemperature 45-49 degree Interface micro USB, USB 2.0 Input 5V/1A (max) Output 5V/1A (max) Dimensions 91*51*25mm Functions hand warmer, power bank Colors silver, pink, black, blue, gray and OEM Certifications RoHS Directive-compliant, FC, CE, BSCI, ISO 9001 Guarantee 1 year