Connection 2-wire, nonpolarity connection Video Intercom: Receive calls from Outdoor Camera/Secondary Entry Station. Surveillance: Monitor doorway and launch a talk during monitoring. Unlock: Release the door at apartment/ secondary entry remotely during talk or monitoring. Parameter Adjustment: Brightness, contrast and volume adjustable

* Screen：7" color TFT-LCD

* Call Time：90s

* Communication：Hands free

* Ringtone：9 pieces

* Ambient Temperature：0~+45°C

* Installation：surface mount

* Product Dimensions(W×H×D)：223×138×29.4mm