Description:Connect the USB control box with the crystal head headset, and use the USB plug with the USB control box to connect to the computer.USB control box with built-in volume switch and microphone/speaker mute for easy control. The crystal head earphone turns the USB earphone cable, allowing your earphone to be used both ways. So you can more comfortable interacting with others.Features:1. Microphone close button: You can turn off the microphone by simply pressing it.2. Volume up or down buttons: You can adjust the sound you want.3. Speaker close button: The speaker can be turned off to avoid unnecessary information transfer.4. Working status indicator light: the standby green light is always on, the call green light is flashing, and the closed sound is flashing red light.5. The RJ9 jack connects to the earphone, and the USB plug connects to the computer.Specifications:Condition: 100% Brand NewCable Length: Approx. 120 cm / 47.2 inControl Box Size: Approx. 8.8 * 3.5 * 1.8 cm / 3.4 * 1.3 * 0.7 inWeight: Approx. 131 gUsage:1. Connect the equipment.2. The computer recognizes the hardware and installs the drive automatically.3. Test call: If not, start menu - control panel - sound and audio devices - voice.4. Sound playback: select the USB Headphone Set device.5. Recording: select the USB Headphone Set device.Package Included:1 x Convert line1 x English manualNotes:1.Please allow 1-3 cm error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard..