Key item features：
1. 3 Key Heating Zones: Covers back and both sides of the chest, with even heat distribution to fend off cold in low temperatures.
2. 3 Adjustable Temp Levels: Low/Medium/High settings, switch easily with a light button touch.
3.Universal Power Supply: Works with standard mobile power banks — no dedicated charger needed, hassle-free warmth on the go.
