1、USB Charging: Easy and convenient to use, the hand warmers can be quickly charged via USB interface, eliminating the worry about battery problems. 2、Long Lasting Warmth: With its unique design, the hand warmers can provide warmth for both hands simultaneously, effectively alleviating the cold in winter. 3、Explosion Proof Design: Warm hand is safe and dependable, avoiding safety hazards caused by overcharging, and protecting the safety of your and your family's use. 4、Compact and Portable: With its compact size, these rechargeable hand warmers are easy to carry, providing warmth for your hands anytime and anywhere. 5、Cute Cartoon Appearance: Electric warm hand adopts a lovely cartoon appearance design, exquisite and fashionable, adding fun and being loved by young people.Item Type: USB Hand Warmer Material: ABS, aluminumBattery Capacity: 3000mAh x 2 (Shipped with built in battery) Battery Energy: 11.1Wh x 2 Input Current: 5V/1A Charging Time: 3-4 hours Working Time: 8-18 hours (tested at 77 degrees Fahrenheit) Weight: Approx. 196.00g / 6.91oz2 x Hand Warmer1 x USB Cable