1. Compatible and universal: The adapter fits most spring-loaded cap-style helmets. The adapter also has slots for headlights, earmuffs, welding masks. 2. Three-speed adjustment: You can press the power button to change the wind speed to suit different environments. 3. Long-lasting work: The powerful rechargeable battery helps the fan run all day with the . 4. : The fan and adapter weigh only 220 grams, and you 't feel any burden when you put the fan on your helmet. 5. Night light: The fan with night light can show you at night or in dark places.<br><br>Colour:As Shown Material:Plastic<br><br>Package Contents: 1x helmet external fan<br><br>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.