Description: 【Long Time Warmth】: Enjoy up to 8-16 hours of continuous heat, great for keeping your hands cozy throughout the coldest winter days 【5 Gear Adjustable】: Features 5 adjustable temperature levels and NTC constant temperature protection, allowing you to easily set the warmth to your personal preference or adapt to changing weather 【Portable Design】: Compact and lightweight at just 9.8cm x 7.4cm x 4.58cm, this hand warmer fits effortlessly into your pocket or bag—ideal for busy professionals on the go 【Fast Heating】: Utilizes advanced double sided rapid heating technology for instant warmth in seconds; crafted from PP, aluminum alloy, and silicone for durability and safety all season long 【Multifunctional Use】: Equipped with a hidden charging port and a built in 3600mAh battery that doubles as a power bank; also functions as a mini night light for added convenience Specification: Material: PP, Aluminum Alloy, Silicone Size Chart: 9.8cmx7.4cmx4.58cm/3.86inchx2.91inchx1.80inch Package Includes: 1 Electric Hand Warmer, 1 USB Cable, 1 Manual Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.