The One-sided heating donut hand warmer is made of ABS and electronic devices, sturdy and durable Mini and compact, easy to carry with the lanyard, 8 second fast heating Three speed temperature can be adjusted: low temperature 35-40 degrees, middle temperature 45-50 degrees, high temperature 55-60 degrees The hand warmer with smooth hand feel,anti-drop and explosion-proof Rechargeable and reusable,with 1200mah large battery capacity,can be use for a long time Specification: Model: Macaron Hand Warmer Power supply mode: USB Power input: 5V/1A Rated voltage: 3.7V Rated power: 5-10W Heating method: charging Charging current: 5V/1A Battery capacity: 1200 mAh Working current: 0.4-0.9A Battery life: 1-3 hours Material: plastic plus electronic devices Size Chart: 80x25x65mm/3.15x0.98x2.56inch Package Includes: 2 Pieces Hand Warmers 2 Pieces Manuals 2 Pieces Data Lines 2 Pieces Lanyards Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!