>Hi-fidelity full duplex intercom; >Support master and slave volume adjustment, and can one click mute; >Single channel analog mixing audio out; >G.711A, G.711U, PCM, ACC multiple encoding types; >30fps@1080P wide dynamic range real-time video; >Face detection, search and playback via NVR and web client; >Hot plugging, automatic state detection, and abnormal voice prompt; >The metal fuselage, full touch buttons.