Bluetooth V5.0 Connection Offering a stable connection for streaming skip-free music and making clearer phone calls, our FM radio transmitter will pair fast with its compatible devices and is equipped with reconnecting function. Support Siri/Google Assistant Allowing you to voice-control Siri or Google Assistant to get directions, make calls, send texts and doing more without taking your hands off the wheel while driving. (Note: Please enable the Siri/Google assistant on your phone first) Independent Microphone Designed with an independent sound cavity with CVC noise reduction tech, the microphone can pick up your sound in a more sensitive way, so it can transmit voice more clearly during hands-free calling. Power On/Off This Bluetooth car charger can be turn on/off by long pressing “b” button, so you don’t need to unplug it every time you get out of the car and worry that it will drain your car’s battery. Strong Compatibility Compatible with any Bluetooth-enabled device such as iPads, iPhones, Android smartphones and more. Workable for most 12V-24V vehicles. 6 Safety Protection Protect your car and your security with multiple safety protections as over-voltage/over-current/over-heat/over-load/overcharge/short circuit protections. Voltage Detection Below 12V: Need to replace battery 12.0-12.8V: Normal voltage for a non-started car 13.0-14.8V: Normal voltage for a started car Note: Please replace the battery immediately if your car is not started and its voltage is below 12V Instructions 1.Adjust your car's FM radio to a blank frequency. 2.Adjust the frequency of FM transmitter to be the same as that of your car. 3.Connect the transmitter to your phone via Bluetooth Package Includes 1 x Bluetooth FM Transmitter 1 x User Manual