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: It's 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: 10000mAh Color: Black, Pink, Gray(optional)Heating Mode: 104F/40C, 122F/50C,140F/60C Product Size: 110 x 63 x 33mm Weight: 185gOutput/Input: 5V/2A Charging 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 women's period or raynauds arthritis sufferers). Package Includes:1 x Electric Hand Warmer1 x Micro USB Charging Cable