1、SEMICONDUCTOR TECHNOLOGY: Neck fan adopts semiconductor cooling technology, the current generated by the semiconductor cooling chip creates a temperature difference to achieve instant cooling. 2、3 ALUMINUM PLATES: Neck air conditioner is equipped with 3 aluminum plates to reduce body temperature (only air conditioner cooling, no fan). 3、2 MODES: Neck cooling fan provides two modes (weak and strong) that can be switched by clicking the power button to instantly cool 12‑16℃. 4、USB POWER SUPPLY: Neck air conditioner fan does not have built in battery, it needs to be connected to power supply at any time when using, and use with USB power supply. 5、SUITABLE OBJECTS: Neck cooler fan has a technological and fashionable appearance, suitable for all ages to wear, and suitable for indoor and outdoor use. 1 x Air Conditioner Fan1 x USB Power Cord1 x Instruction Manual Item Type: Air Conditioner FanMaterial: ABS, AluminumVoltage: 5VCurrent: 2.2AMode: 2 GearsAluminum Block Temperature: Ambient Temperature ‑11℃ to ‑16℃Gross Weight: Approx. 417g/ 14.7oz