1、Fast Heating: The hand warmer can provide you with instant double sided heating in just a few seconds. One key easy to use system, one key quick temperature rise 2、Portable Lanyard: The hand warmer has a curved shape, which allows you to easily hold it, with a lanyard that can be easily put into your pocket 3、Rechargeable Battery: The hand warmer has a 10000 mAh rechargeable battery, which can ensure long lasting heating for up to 8‑12 hours, and can be used as a backup battery for USB devices 4、2 Kinds of Heating: The hand warmer has 2 different temperatures of 60°C and 50°C, with a power display, allowing you to easily understand the heat setting and remaining power 5、Scope of Application: Very suitable for outdoor sports and activities, indoor offices, transportation, indoor games Item Type: Hand Warmer Product Material: ABS, Aluminum Alloy Charging Input: 5V/2A Charging Output: 5V/2A Heating Temperature: 60℃ in the First Level, 50℃ in the Second Level Rated Power: 7-10W Battery Capacity: 10000mAh Lithium Battery (shipped with battery) Product Size: Approx. 97 x 67 x 32mm / 3.8 x 2.6 x 1.3in 1 x Hand Warmer 1 x Charging Cable 1 x Lanyard 1 x User Manual