The OneNav Pro ON821-1A is a 9-inch Android head unit designed for direct OEM-style replacement in compatible Mercedes ML vehicles. It uses a Rockchip RK-PX6 CPU with Mali-T864 GPU, 4GB RAM and optional 64GB flash storage, a 1280×720 capacitive 5-point touchscreen, NXP6686 radio with RDS, Ublox6M GPS, RTL8188 WiFi and CSR Bluetooth for audio and phone connectivity.

This unit maintains original vehicle functions such as steering wheel controls, parking sensor and air condition displays when supported by the vehicle. It includes a 15-band DSP, TDA7560 4x50W power amplifier, 5.1 RCA outputs, three USB ports, extensive video and audio codec support including 4K H.265/H.264 decoding, and optional TPMS, reverse camera, OBD and DVR integration. CE and RoHS compliant with specified operating temperature and humidity ranges.