It’s an electric hand warmer (i.e., emits heat) that also functions as a charger with 9,000 mAh capacity. Can plug in a USB-A or USB-C cable. To recharge the charger, use the included Micro-USB cable. Also comes with original bag and manual. Occasionally used and has some scuffs but otherwise in great working condition. About 2.25” wide x 4.75” long x 1.25” thick.