Features: - Great for air current circulation， sweat-resistant and anti-fog
- Can be installed at both right and left side of protective mask according to your comfort
- Powered by 2 x AA batteries ( not included )
- Made of high-quality TPU， durable to use

How to use:
- Press the open button for opening the lid.
- Press the delaying time button for turning on the fan ( 8 minutes after turning on， the fan will turn off automatically to prevent the damage of the fan in case you forgetting to turn off ).
- After stopping， there is no effect on turning on or off the fan again.
- No need to take out the batteries while no using， it will be into a resting condition. 0.090 Package weight: 0.123 kg
Product Size(L x W x H): 9.20 x 9.20 x 5.80 cm / 3.62 x 3.62 x 2.28 inches
Package Size(L x W x H): 10.20 x 10.20 x 6.80 cm / 4.02 x 4.02 x 2.68 inches Package Contents: 1 x Electric Fan Filter Tank