Electric heating socks, your best choice
1. Find equipped charging cable in battery pocket.
2. Connect the cable port into the battery.
3. Turn on the battery by pressing ON/OFF button twice consecutively.
4. Press ON/OFF button to 3 levels of manual temperature adjustment. High (Red): 65℃ (149℉); Medium (Green): 55℃ (131℉); Low (Blue): 45℃ (113℉).
5. To end heating by pressing and holding ON/OFF button for 2 seconds.
6. Do not keep plugging into battery during leave the socks unused for long time.