... Suppression/DSP Technology 3,Built-in Speaker&Microphone/FM Transmitter/Wireless Earphone piece 4,Supports U-disk and SD/MMC Card ... function7,Built-in rechargeable lithium battery8.Can be connected with parking sensors and camera9. 2,3,4sensors for option10.Step-up ... .5inch digital TFT LCD screen 12. Rearview mirror display with bluetooth function NEW design parking sensor