S-PACK 1400 B POWERSOCK BATTERIES
"The S-Pack 1400 Bluetooth battery is the most efficient in the range. With Bluetooth technology, you can adjust the heat settings remotely using your smartphone.
-Warm feet for up to 16 hours
-Pack comes with a USB charger
-Wall charger not supplied
-S-Pack batteries are suitable for use with the Therm-ic PowerSocks heated socks"