Features:2-in-1 Hand Warmer: The portable hand warmer is not only designed to keep your hands warm during cold weather, but also serves as a power bank for emergency charging of your electronic devices, such as smartphones.Instant Heating with Adjustable Temperature: Experience immediate warmth with the hand warmer, which offers three temperature settings to suit your preferences. The user-friendly digital display allows for easy monitoring of the selected temperature.Innovative Carbon Crystal Heating Technology: Utilizing reliable PI carbon crystal heating technology, it emits infrared radiation that closely matches the human body's wavelength, effectively penetrates the skin and ensuring efficient heat absorption.Long-lasting Battery with Multiple Safety Protections: Equipped with a high-capacity 5000mAh battery, it provides extended usage time. Additionally, it features safeguards against overcurrent, overcharging, overvoltage, and short circuits, ensuring a safety and worry-free experience.Stylish and Compact Design for Outdoor Activities: The stylish and compact design of the hand warmer allows for easy portability, making it perfect for outdoor activities such as camping, fishing, hiking, and skiing in cold weather. It effortlessly fits into backpacks or pockets, ensuring convenience on-the-go.Specifications:Color: White/Pink/Dark Green/Black(optional)Material: ABS + Aluminum AlloyVoltage: DC5VBattery: Built-in 3.7V, 5000mAh Lithium BatteryCharging Time: 5H±1HWorking Time: 2.5-12.5 HoursItem Size: 102 * 61 * 30mm/ 4.0 * 2.4 * 1.2inItem Weight: 100g/ 3.5ozPackage Size: 120 * 64 * 34mm/ 4.7 * 2.5 * 1.3inPackage Weight: 160g/ 5.6ozPacking List:1 * Hand Warmer1 * USB Cable1 * User's Manual(English)