1.Two-way voice transmission; automatic two-way intercommunication without pressing button; suitable for two-way intercom between hospitals and clinic desk 2.Recording output jack; teller intercom can be connected to external recording equipment; automatically recognize the voice signal being processed during the call; no need to take any measures 3.Clear sound quality; window speaker intercom system brings clear and natural sound; high-sensitivity microphone with anti-interference function 4.High power window speaker; adopts high power input and output technology; loud and clear sound; RT-9908 intercom with a dedicated side tone processing chip 5.Flexible microphone neck; the window microphone can be adjusted to a suitable angle according to the installation position and the user's height; the microphone cable is 2m 6.Independent volume control; internal and external volume of window speakert can be adjusted separately according to the environment 7.Simple installation; turn on the power and press the switch; the power indicator will remind you of the corresponding working status 8.Streamlined design; window microphone with speaker has full metal shell; beautiful appearance; high-quality materials and components make the signal output perform well 9.Simple operation; simple design of three buttons; inner and outer volume adjustment knob and switch button; easy operation even without manual