Mic Mute Switch
Headsets / Handset Switch
Mic Volume Control
Rx. Volume Control
Electric / Carbon Telephone Support
Compatibility of Telephone Type (3 type support)
AGC (Auto Gain Control)
Mute Indicator - RED
USB Power Support ( Optional Accessory - USB Power Cable)
5V~6.3V Power Adaptor or AAx2 Battery using
Option: Low Battery Indicator - Yellow / Battery Saving
