[2 in 1 Hand Warmers and Power Bank] In an upgrade aluminum design, take only 5 seconds to quickly heat up, 360 surround heating, and palm-size, it's comfortable to hold and portable for outdoors to keep hands warm in winter, and provides backup power source for your cellphone. [10000mAh Rechargeable Power Bank]Built-in 2 pack 5000mAh polymer lithium-ion batteries, the handwarmer can be fully in just 3 hours. As a power bank, it can fully charge electronic devices like mobile phone with the provided USB-C charging cable(output: 5V/2A ). Type-c also have output function more applicability. No worry about cellphone's battery dying when you are out. Note: When heating function is on, the hand warmer cannot charge other devices. [Absolutely Safe to Use] first, the hand warmers are designed with over-current, over-voltage, over-temperature, short-circuit, over-heat, over-charge and other security protection circuits. [ & Portable]The shell of hand warmer is made of High-quality materials, which conducts heat quickly and has no peculiar smell, and the frosted design is more comfortable to hold. Small well-constructed body makes it , easy to grasp, and slip into gloves or pocket. [Great Winter Warm Gift] In cold winter, this electric hand warmers become a must-have kit to keep warm and will be a surprising gift for family and friends on Thanksgiving, Christmas, New Year, birthday, Valentine's Day and others, and it is the for outdoor sports enthusiasts, such as hunting, climbing, hiking, fishing, golf, traveling, camping, skiing, cycling, etc. Product Description: it is a to family or friends in cold winter, warm the whole winter Hand Warmers Rechargeable - Warm your both hands Small-sized-Ergonomic Design - One-handed grip EasyTo Use - usb hand warmers rechargeable are easy to use Hand Warmers Rechargeable Owner's Manual: 1. Press and hold the power button for more than 3 seconds to turn on the hand warming mode. (red light display) 2. When the hand warming mode is turned on, each short press can adjust the heating temperature. 3. Press and hold the power button for more than 3 seconds until the hand warmer mode is off 4. Red LED ring: High temperature: 122-131 (50-55) for a 3-4h working time 5. Blue LED ring: Medium temperature: 113-122 (45-50) for a 3-5h working time Important 1. Please use 5V / 2A adapter to charge our hand warmer 2. Please keep the handwarmers away from the water 3. If it is not used for a long time, please put the USB hand heater in a ventilated and dry place after fully Material: aluminum, plastic colour: black Package Contents: 2 x Rechargeable Hand Warmer(blue and red) 2 x USB Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.