Tuck it into your scarf for a cozy touch! Above all, the cordless and lightweight design makes it extremely user-friendly! Three selectable temperature modes. Even in the dead of winter, when you get a sudden fever and it's chilly, it's in high mode. Once it warms up, switch to a gentle mode. You can easily switch between them. Rechargeable and reusable. Size adjustable with magnets. Because it's thin, it can also be tucked into scarves or outerwear. Recommended for indoor cold protection. Since the neck area is warm, blood circulation improves. ・Power supply: DC5V 0.4A ・Power consumption: 2.5W ・Rechargeable battery: Lithium-ion battery 3.7V 1000mAh Charging time (approx.) 3 hours Total usable time on full charge (approx.) 1.5 hours (high) ~ 2 hours (low) (at room temperature 25°C) Auto off (approx.) 30 minutes Set temperature (approx.) High: 50°C, Medium: 45°C, Low: 40°C　 Power cord (approx.) USB cable: 400mm (Type-C)