Specifications Overview
The document outlines the specifications for the 4CH 1080P Mobile DVR models CV-MR421S and CV-MR421N. Key features include H.264 high-performance video compression, GPS/G-Sensor logging, and event triggering. The devices support 3G/4G/Wi-Fi routers via Ethernet and have an optional built-in backup power. They offer a record rate of 30fps at 1080P and support up to 256GB*2 SD card storage with an anti-vibration design.

Video and Audio Specifications
The system supports AHD/TVi/NTSC/PAL formats with 4-channel video/audio input and RCA outputs. The S/N ratio is greater than 40dB, and the screen display options include 1/2/3/4. Live resolution is NTSC: 720(H) x 480(V) and PAL: 720(H) x 576(V). Recording resolutions include D1, 960H, 720P, and 1080P with frame rates of 30fps for NTSC and 25fps for PAL.

Recording and Storage
Recording quality can be set to low, middle, or high, with an automatic overwrite mode. The devices support multi-tasking for live, record, play, and network functions. Storage is supported via SDXC SD cards up to 512GB.

Connectivity and Control
The models feature USB2.0 ports, GPS G-Mouse type supporting NMEA 0183 protocol, and a 3-axis G-force sensor. Ethernet connectivity is available on the CV-MR421N model with RJ45 Ethernet 10/100M. Remote control options include monitor, playback, backup, DVR control, GPS, and map functionalities.

Environmental and Physical Specifications
The devices are designed with anti-vibration and shock-proof features, compliant with ISO16750-3. They operate on DC 8~36V power, with an operating temperature range of -10 to +60℃ and humidity less than 90%. Dimensions are 135(W) x 40(H) x 135(D)mm.