Features:-3 second fast heating and warmth without waiting for PI carbon crystal heating technology, releasing infrared light wave radiation heat close to the wavelength of the human body, easy to penetrate the skin and be absorbed by the human body-Internal motherboard algorithm optimization, more intelligent management of battery charging and discharging cycles, maximizing battery capacity- It is both a hand warmer and a power bank. The large capacity can be used for emergency charging of mobile phones, and the USB interface can be used with any mobile phone.-Three levels of temperature regulation are visible, safe and without any hidden dangers. Do your thoughtful and good thing, five safety precautions, and nearly a hundred safety tests-Lightweight and warm, easy to handle with one hand or put into a pocket without any burdenSpecificatoin:Product Name: Mini Digital Display Warm Hand TreasureInput: 5V 2A MaxWorking hours: 2.5-6h (Depending on different gears/usage scenarios)3 levels of temperature: 40C - 50C - 60CProduct size: 108 * 45 * 75mmPower: Lithium ion batteryCharging time: about 4hProduct weight: 240gProduct List:Hand Warmer * 1Charging cable * 1Instructions * 1