Features： 1、PU Leather Sheath: The neck warmer is more comfortable to wear with a high elastic PU leather sheath. The PU leather sheath can be wiped and cleaned with a damp cloth, which is durable. 2、Temperature Range: The temperature of the rechargeable neck warmer can be controlled at 36‑58 ℃ to meet your needs for temperature adjustment. 3、Quickly Dispel Body Cold: Warm compress at low temperature to promote blood circulation. Strong cold resistance, not afraid of cold outdoor. 4、3000mAh Capacity Battery: The portable neck warmer can work for 3‑6 hours with 3000mAh large capacity battery. 5、LED Display Screen: The LED display screen is more convenient to use, with digital display of temperature and power. Specification： Item Type: Neck Warmer Product Material: PU, ABS Weight: Approx. 335g / 11.8oz Input Voltage: DC 5V Working Current: 3.7V, 0.91~1.85A Working Time: 3-6 Hours Heating Temperature: 36-58℃ Battery Information Lithium Ion Battery 3000mAh (Shipped with Built in Battery) Product Size: Approx. 145x68x190mm / 5.7x2.7x7.5in Package List： 1 x Neck Warmer  1 x Charging Cable  1 x Manual