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Dear customer, thank you for your trust and support! Please read the following instructions before ordering.Thanks. Features: Flexible rotation arm Noise cancellation microphone Easy to install Provide the voice recorder port 35 degree slope, easy operation Functions: FSK/DTMF caller ID display, automatic checking 30 incoming, 5 outgoing number memories 2 digits PABX code setup 32 digits pre-dial and edit Green Backlight in-use With LED indication Flash and Mute function Headset speaker volume control by knob Flash time 100ms or 600ms choice Power save function Package included: 1 x Dialpad 1 x Headset 1 x Connect Cord 1 x User Manual Note: 1. As for the mute key, it goes like this. During the call, when you press "this key", the microphone will stop working, the indicator light will turn red. Press "this key " again, the call will function again. 2. It can display call ID, please confirm if you have already activated the function.