Mobile Warming 3.7v Powersheer Micro BT Battery MWCB37V42221
This Dual pack of Powersheer® Micro rechargeable Li-ion batteries are compatible with Fieldsheer standard heated socks, thermal heated socks, and merino heated socks. Control your heat levels on your socks by a press of the battery or Wireless remote button to select between High, Medium and Low heat. Recharge using the included Micro USB to USB cable for hours of heat.