【Cooler and Safer】Upgraded neck fan with long air vents, innovative turbo fan blade design, efficient air division and softer cool breeze feeling. Adopt individual charging protection circuit to protect the device from overcharge, overdischarge, overcurrent and short circuit, combining DC-DC fixed frequency, which protects the motor from damage. 【Free Your Hands】The hands-free fan was designed as a headset to free your hands everywhere. The fashion style makes you look very cool. Hanging around your neck, it is suitable for traveling in hot weather and saves you from sweating in public on many occasions. 【USB Charging & 3 Adjustable Wind Speeds】USB powered rechargeable fan, can be charged by computer, phone charger, mobile power, etc. The built-in 4000mAh battery provides 5-17 hours of battery life (depending on the speed). 2 hours of charging and up to 10 hours of use. Press the power button to adjust the fan speed according to your needs. 【Quiet and Comfortable】The excellent