Ultrathin Portable 7 inch Touch Screen Car GPS Navigation FM HD 4GB+8GB New Map, Built-in GPS Antenna / Bluetooth / FM / Video Input News USA Maps. FM Transmitter If volume doesn't work, please turn off the FM function ,then it turns sounds. If navigation doesn't work please reset the gps and first search the satellite outside and sunlight weather,then you will search the satellite. Built in Bluetooth and Video input Ultra-Thin, Thickness: 0.7mm Ultra-fast CPU, ARM Cortex A7 800MHz