The ColdSky battery-powered fan features a powerful 20000mAh rechargeable battery. It can run continuously for 40-50 hours at the lowest speed when fully charged. It also comes with USB-A and USB-C dual charging ports for emergency charging The ColdSky camping fan is equipped with powerful dual motors and dual-layer fan blades, offering 8 adjustable wind speeds. This advanced technology helps the turbine drive more air faster, providing double the wind power of traditional outdoor fans. It can reach a blowing distance of 13.12 feet, as well as for use as a site fan, industrial fan, and ventilation fan. The personal fan comes with a convenient remote control for easy operation. Power on/off, increase/decrease wind speed, set timer (1H/2H/4H/8H), turn on/off auto-oscillation (45°/90° two modes), turn on/off sleep mode (all indicator lights off), easily complete various settings with just one click. The travel fan with sleep mode has an automatic oscillation function, with options for 45° and 90° angles. The fan's head can also rotate up and down 270 degrees, making it easy to adjust the fan to the optimal blowing angle, especially suitable for sleep.