Feature:Attentions:Please do not charging and heating simultaneously.Do not place it in humidity, high temperature, long-time exposure to the sun, fire etc.When at high temperature, please do not warm for long time with skin directly to avoid burns.Keep away from children when charging.Smart Instant Heater: Hand warmers can rapidly warm up double sides in seconds. Double-sided chip design, Overcharge, over-discharge and overheat protection.3 Temp Mode: Skin-friendly, adjustable temperatures 40/104F-50/122F-60/140F at your choice. Shockproof, anti-scald, anti-skid, explosion-proof.Pocket-Sized Power Bank: 10000mAh lithium ion rechargeable built-in battery with Micro USB charging port. Be a power bank to charge your electronic devices in emergency.Perfect Gift: Its a MUST HAVE to spend a cold winter, especially for raynauds arthritis sufferers for heat therapy needs. A great gift for Thanksgiving Day, Christmas, Birthday.Smart Application: 3 in 1 function (Warmer, LED flashlight, vibration massage) daily use in winter for the seniors, use in school for your kids or outdoor sports.Material: Aluminum Alloy +Lithium BatteryBattery Capacity: 10000mAhColor: Black, Pink, Gray(optional)Heating Mode: 104F/40C, 122F/50C,140F/60CProduct Size: 110 x 63 x 33mmWeight: 185gOutput/Input: 5V/2ACharging Times: About 3-4 Hours in FullWorking Times: About 2-8 Hours( based on various ambient temperature)User Guidance:Double-click power, One-click switch temps, double-click flashlight, three-click vibration function.Press the power button for 3 seconds and instantly release the warmth for you. It rapidly warms up double sides in seconds.Double-click to turn on/off flashlight.Three consecutive presses to turn on/off the vibration massage mode (relief womens period or raynauds arthritis sufferers).Package Includes:1 x Electric Hand Warmer1 x Micro USB Charging Cable