A single switch controls both pickups independently, and separate volume controls give you even more control over the sound. Powered by 2 AAA batteries, the working time is more than 200 hours (the battery is not included in the delivery) Provides the wearer with a maximum pickup effect of 6 times 3.5mm dual-channel audio interface can be connected to audio equipment such as mobile phones and computers Low noise/frequency tuning for natural sound clarity Type: Headphones Wearing method: head-mounted Noise reduction rate: 25 Function: pickup, noise reduction, walkie answering Material: ABS colour: Green Package Contents: 1 x Earphone 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.