If you need more heat than your included batteries can offer, grab these batteries as back-up and extend your toasty-toed adventures. With up to 16 hours of warmth, the S-Pack 1400B rechargeable battery offers 3 different temperature settings that you can control via the onboard button, or over Bluetooth. Bluetooth compatibility lets you to adjust the temperature through the free Therm-ic app.
- Bluetooth™ enabled batteries let you control your socks with your phone
- 3 temperature settings adjust via Bluetooth or with the touch of a button
- Lightweight lithium-ion batteries last for up to 16 hours
- Battery packs attach snaps to the cuffs, where they are out of the way of boot tops
- Includes 2 batteries and a USB charger that can charge both batteries at once
