FM Transmitter, Otium Bluetooth Wireless Radio Adapter Audio Receiver Stereo Music Tuner Modulator Car Kit with USB Charger, Hands Free Calling UNIVERSAL COMPATIBILITY: The Car Bluetooth Receiver works with smartphones iPhone, iPad, iPod, Tablet and moreSupporting AUX output and input, work with Micro SD, TF card or MP3, MP4 players via 3.5mm audio jack. HIGN PERFORMANCE: Support A2DP, achieve the stereo music lossless transfer to your car speaker. Built-in microphone feature can offers your hands free talking and wonderful music. HUMANIZED DESIGN: 1.44inch LED screen display can show current voltage of the storage battery of your car, the name of songs or caller ID, connect information, also FM channel and volume. CHARGING STATIONWith an universal USB port, charging your cellphones or other devices as car charger. Such as apple iPhone 7 6 6S PlusAndroid Smartphones, Power Bank etc. EASY TO USE: Just plug the Otium best Bluetooth FM Transmitter in the car cigarette lighter, control it and the car radio at the same frequency (frequency range from 87.5 to 108 Mhz). Then let your phone/audio player connects this FM music gear via bluetooth/audio line. Press and hold the multifunction button 8-10 seconds, switch voice prompts in English or Chinese. Adjust your transmitter and car radio to the same FM station to avoid noise. To make sure the perfect sound, don&#039;t adjust the sound volume of the your car speaker to maximum; If you need louder sound, you can adjust the sound volume of your phone or FM Transmitter. The product contain a AUX cable, but not include a TF/ Micro SD card.