Features: Cooling in one second, the industry's black technology cooling and heating two-in-one artifact, rapid cooling in one second. Instant cooling like ice cubes, the latest generation of upgraded cooling and heating principles, intelligent chip control temperature, cooling and heating provides three-level function selection, powerful functions. 2600MAH battery, type-c fast charge protocol 80 minutes to fully charge quickly. Stronger battery life and long-term cooling. The product is equipped with two highly sensitive detectors, which can intelligently control the humidity at the degree you adjust to maintain a constant temperature according to the algorithm. The neckband fan is lightweight and made of soft skin-friendly silicone material to provide comfortable neck protection.