... channels, Vidoe and Audio Synchronization. *Distance: (Open/No obstructed space) 1000~4000m . *Package Including: 12 channel Receiver, Transmitter, antenna, Video ... , USB camera, car camera,standalone DVR, all in one LCD combo DVR, car DVR, DVR card, CCTV KIT, Wireless ... surveillance systerm,LCD and Monitor, lens, cctv accessory etc. 12ch 2000mW wireless audio ...