This intercom adopts high performance electro-acoustic circuit technology; the output power up to 3W; anti-interference and noise reduction; makes voice clear and loud Inside and outside have separate speaker and microphone; microphone volume and sensitivity can be adjusted separately Two-way communication window intercom; identification and automatic processing of audio signals; no need to press any button; easy to operate and convenient to use The microphone line outside is 187cm; more convenient and easy to install and use; Microphone not only transmit sounds clearly; the height also could be adjusted according to your needs Sturdy and durable; with thick metal panel; scratch resistance; applicable to banks; at order points; at the counters; at toll stations; at bus stations to keep a safe social distance