This compact and stylish Auto Drive Low Profile Bluetooth FM Transmitter is a must have item which is very easy to install and operate. After you pair it with your Bluetooth device, you can use it to wirelessly transmit audio from your devices to car FM stereo by adjusting the radio and transmitter to the same frequency. The built-in microphone and hands-free function switch between incoming calls and music seamlessly which also cause less distraction during driving. Equipped with dual USB charging ports that can charge your device up to 2.4A (one of the ports reads USB flash disk too). LED screen displays frequency clearly and its internal safeguard system protects your device from overcharging and overheating. It is compatible with Bluetooth enabled devices, like smartphones, tablets and more. The Auto Drive Low Profile Bluetooth FM Transmitter is designed to keep up with your active lifestyle, and it makes a great helper for road trips and everyday driving. Input: 12-24V DC/2AUSB• Output: 5V/2.4 A Max Bluetooth Version: Bluetooth 5.0 Transmitting Frequency: 88.1-107.9MHzFM Emission Effective Distance: 6ft Bluetooth Effective Distance: 32ft。 • Auto Drive Low Profile Bluetooth FM Transmitter. • With Hands-Free Phone Calls&. • Answer calls hands-free • Wide compatibility :bluetooth car fm transmitter can be paired as a hands-free kit with all bluetooth enabled devices, such as iphone, ipad, ipod, tablet, samsung, htc, sony and other andriod smartphones. • Multi-safety protection :comes with built-in over-current protection, over-voltage protection, intelligent temperature control, short circuit protection. • Wireless transmit phone call or music from Bluetooth smartphone to car FM stereo system. • Built-in microphone, support hands free call. • Auto-switch to music playing mode after phone call. • Built-in protection system against overcharging & overheating. • Compatible with Bluetooth enabled devices. • Input: 12-24V DC/2AUSB• Output: 5V/2.4 A Max • Bluetooth Version: Bluetooth 5.0 • Transmitting Frequency: 88.1-107.9MHzFM • Emission Effective Distance: 6ft • Bluetooth Effective Distance: 32ft