... 2. Audio volume can be adjusted 3. 2.4GHz 4-Channels Audio AV Product Feature: 1). Infrared LEDs for nightvision, Effective ... lines clear picture display,3). With frequency control switch, 4 channels adjustable,support multi-camera4). Camera Support UP, Down, Left, Right ... inch TFT Color LCD Monitor,built-in 2.4GHz 4-Channels Receiver7). Support PAL/NTSC System.8). Remote Control with Full ...