This device supports full frequency point transmission, frequency range: 87.5-108 Mhz FM FM transmitter. | Support Bluetooth hands-free calling. Built-in microphone. Convenient and secure call. Support U disk, TF card expansion play MP3.WMA.FLAC. Alsoyou can answer/hang up/reject/retransmit via Bluetooth. | Bluetooth stereo music playback. Call echo cancellation and noise reduction (CVC) technolog. Support Bluetooth hands-free calling. Built-in microphone. Convenient and secure call | Insert the product into the car cigarette holder. After turning on the power, the display will show the current voltage of the car battery and monitor the battery status of your car. | Wirelessly Play Music, Make hands-free calls and Charge your device with the advanced Superior design of the FM Transmitter Car Kit Device Compatible with iPhone 11 pro max Xs Xr X 8 8+ 7 Plus 6S, Samsung Galaxy S10+ S9 Plus S8 S7 Edge Googple Pixel 4 3 2 XL Sony XA2 XA XZ3 XZ2 LG V50 V40 V30 V35 K35 One Plus 7 6T 5T 3T Android Smart Phones