Advanced semiconductor chips provide fast cooling with lower noise than traditional fan Creates quiet environments perfect for study rooms, libraries or bedrooms Features both USB charging and plug in power modes for flexible use Ideal for travel, offices or home without worrying about power sources Manually adjust angles 180 degree for a wide angles, natural wind, and is comfortable even during prolonged use The built-in display screen shows real-time information for fan speed, battery levels, and cooling modes, ensuring you ' re always informed about the fan condition Desktop & Wall Mounted: Includes a wall mount base, allowing easy installation on wall in your study, bedside, kitchen, or offices