Features: 1.Constant Temperature Heat: Adopting constant temperature heat technology, efficiently transferring heat energy and heating up in 3 seconds. 2.Large Heating Surface: The heating piece with aluminum alloy, to achieve a large heating surface, from the palm of the hand to the fingers warm. 3.Charging Protection: Automatic power off protection to prevent overcharging, so you can be safe and secure when warming up. 4.Temperature Adjustable: Large screen digital display, three temperature regulation, visualization of the temperature is more secure, the use of more assured 5.Comfortable to Use: With rounded appearance and palm size, which is lightweight, portable and comfortable to use. Great for home, school, office or outside. specification:Item Type: Cute Hand Warmer Material: ABS, Aluminum Alloy Built in Polymer Lithium Battery: 5000mAh PackageList: 1 x Hand Warmer 1 x Charging Cable 1 x Instruction Manual 1 x Chain