1.H.264 3G GPS D1 car black box 2.Double SD card support up to 128G 3.Patent ... (optional)Built-in 3G wireless transmission module, WCDMA, CDMA2000, Compatible with GPRS, EDGE;Built-in Wi-Fi moduleData remote transmissionSupport 3G ... strategy, remote downloadPTZ controlSupportGPS(Option),Support built-in GPS module with geographic coordinate, speed, information, etcG-sensor Built-in G-SensorSystem ...