The sound controller Compatible with FOR QC45 QC35 Headphones. Easy to use, no driver required, this USB audio controller can start work as soon as you insert it into your device. NOTE: This volume controller can only adjust the volume of the headphones, but not the volume of the computer itself. USB: USB2.0 Operating voltage: DC 5V±0.3V Operating current:Less than 20mA decoding signal-to-noise ratio :~97dB sampling rate: 96KHz/24bit Headphone driving capability: 16~150Ω Device jack: 3.5MM Support broadcast parameters: 8K/16K/22.05K/32K/44.1K/48K/88.2K/96K Support audio bit depth: 16/24bits Colour:Black Material:ABS Package Contents: 1 x Headphone Volume Controller 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.