Description:1. The power supply is wide voltage 9v-36v input, suitable for bus, minibus & car installation.2. The power cable is directly connected to the car battery. The car key control cable can automatically start & shut down the DVR machine to ensure uninterrupted video recording. When the vehicle is stopped & the car key is removed, the machine will stop recording & automatically switch off, which is easy to operate.3. HI3520DV200 professional industrial grade chip, high performance A9 processor, four-way CVBS or AHD 720P video signal simultaneously single independent HD recording, independent playback view. Can support four audio signals 4. Supports four-segmentation, three-segmentation, two-segmentation, single-segmentation & other segmentation modes for convenient & quick viewing of surveillance scenes.5. Video output can be connected to the monitor with AV output or VGA output channel, VGA output resolution is 1920*1080 Pixels 6. Video output can be connected to the monitor with AV OUT port output or VGA output channel, VGA output resolution is 1920*1080 Pixels 7. Three-way reversing ACC control line can quickly respond to reversing, turning left, turning right & other vehicle actions in microseconds, & switch to the corresponding channel to monitor the vehicle running scene.8. With high-speed SD card holder, it can support 32GB, 64GB, 128GBSD high speed card with universal capacity on the market.9. H.264 protocol video codec, file format is AVI, effici