Feature: 1. MAGNETIC 2 IN 1 HAND WARMER: Innovative 2 in 1 design, with 6000mAh total capacity. Use separately or combine magnetically for versatile warming options. Magnetic attachment ensures secure combination for easy carrying and organization. 2. SAFETY FEATURES: Rechargeable hand warmer, crafted from heat resistant pure aluminum alloy and fireproof ABS material. Built in AI chip for precise temperature control, prevents overheating while maintaining constant warmth. Against overcharging, overvoltage, and short circuits. CE, UL, and FCC certified after rigorous quality inspections. 3. 3 ADJUSTABLE LEVELS: This handwarmer has 3 adjustable temperature levels (105-143℉), choose your most comfortable heat. Fast heating, easy to hold and can be easily put into a pocket, keeping warm anytime and anywhere in the cold winter. 4. LONG LASTING 20H BATTERY: Powered by 2pcs 3000mAh batteries (6000mAh total), this hand warmer provides up to 20 hours of continuous warmth. Quick 3 to 4 hour charging time via USB. Enjoy warmth with 1 second rapid heating technology. 5. PRESENT FOR WOMEN AND MEN: Ideal winter gift choice for your friends and family. Ideal for birthdays, anniversaries, Thanksgiving, and other occasion. Suitable for activities like fishing, golf, camping, and skiing. Specification: Item Type: USB Rechargeable Hand Warmer Material: Aluminum, Flame Retardant ABS Battery Capacity: 3000mAh x 2 Battery Energy: 11.1Wh x 2 Input Current: 5V 1A Charging Time: 3-4 hours Working Time: 8-18 hours (tested at 77℉). Package List: 2 x Hand Warmers 1 x Charging Cable 1 x Instruction Manual