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.

Features:

• Bluetooth function
  
• 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
• Heated Socks sold separately**