TelPal Corded Telephone with Noise Cancellation Headset for Call Center Analog Wired Landline Home Office Phone for Business, After Sale Service, Telemarketing, Online Jobs, Training, Education. Noise Cancellation Headset: High quality headset, hear the caller voice clearly.( this phone is line power, do not need battery,Two fake batteries sockets do not influence normal work FSK/DTMF Caller ID Display: Display the caller numbers clearly,with green light ability. Knob Volume Adjustment: Adjust the most suitable volume by scrolling knob. Comfortable Sponge mats: Soft headset cushion to protect your ears from long time wearing. Easy to set up: Plug the phone line provided to your telephone jack, and it will display the data on screen.