The S-Pack 700B battery pack delivers up to 7 hours of warmth and lets you control your Therm-ic or SIDAS heated socks via Bluetooth on your smartphone. Set includes two Bluetooth-enabled rechargeable batteries and a dual USB charging cable (charging cube not included).

• Bluetooth control via smartphone app
• Three manual and ten Bluetooth-adjustable heat settings
• Charges both batteries at once via USB
• Compact and lightweight