Features: 1. The same battery cell for new energy vehicles: The advanced 21700 battery is used, the cell capacity is increased by about 35%, and the energy density is increased by about 20%. 2. Multi-angle large arc surfaces neck warmer: ergonomic, large area, uniform heating from multiple angles. 3. Three-speed temperature adjustment: There are three temperature options to match different skin tolerance, and refuse to scald the skin due to exceive temperature. 4. Care for the health of the cervical spine: working at the desk for a long time or playing with your mobile phone for a long time will cause exceive tension in the neck muscles and poor blood circulation, which will cause chronic muscle strain and deformation of the cervical spine. 5. Long-lasting battery life: 9600mAh capacity, the battery uses the same model of Tesla's new energy car battery, a single cell 4800mAh, safe and high-strength performance. Description: The neck warmer canrelieve your sore shoulders and necks with three-speed temperature adjustment and multi-angle large arc surfaces. Specifications: Material: ABS+Aluminum Alloy Use time: 6-10 hour Product ruler 180*175*58MM Battery: 9600mah Material: PVC Package Included: 1 pc * warmer Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.