3.5" overall. Up to two hour runtime. Battery and heat indicator lights. Up to 113F/45C operating temperature. Continuous gentle warmth on both sides. High and low heat settings. 5V1A micro USB port (cord included). Auto charging feature. Power bank feature also recharges USB compatible device. Requires (1) Lithium battery (included). Black. Clam packed.
May not ship Post Office or International. Made in China.