HQTelecom Hands-free Headset with Backlight Caller ID LCD Display EASY SET UP. Connect to any existing standard analog (landline) telephone wall jack. Attach your headset and you, and enjoy the hands free talking! SIMPLE OPERATION. This is a fully functioning single-line telephone with convenient controls to help you work faster and smarter. Just press the on/off button once to answer an incoming call, and then again to end the call. USER-FRIENDLY CONTROLS. Adjustable receive and transmit thumb wheel controls let you manage the precise volume of each call. On/off, microphone mute, flash and redial buttons make it easy to dial and receive calls. In-use LED and mute indicators provide excellent call visibility for you and others in the office or home. HIGHLY PRODUCTIVE. An extension jack allows connection to a second phone or modem. The handy headset hook keeps your desk area neat and organized. QUALITY ASSURANCE. Recording jack connects to a recording device for call monitoring and quality assurance purposes.