Fan with Face Interface Bracket For 3: Built-in two high-speed silent fans, the fan speed is 7000 rpm, built-in 500mAh lithium battery, can work normally for about 3 hours. Adjustable Height: The left and right knobs can adjust the height of the mask to better suit users wearing glasses. Pulsator Adjustment Design: External pulsator rotates to adjust the space height of the mask holder Magnetic Installation Design: The fan has two-way magnetic suction and is easy to install and remove Fan Installation: Align the position of the mask fan base, place it at an angle of 45°, and install it automatically with magnetic suction. Fan Emergency Power Supply: The fan consumes very little power, Provides emergency power for 3. Reduce Stress: The effective force-bearing area of the mask is increased by 95%, greatly reducing pressure and making it more comfortable to wear. Internal and External Air Circulation: With two-way air circulation, the lenses are less likely to fog up and feel more breathable when worn. Blackout Design: The X3 air circulation mask adopts a light-blocking nose pad design, which has a good anti-light leakage effect. Colour:As Shown Material:abs Package Contents: 1 * cooling fan 1 * mask Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.