【Dual Connectivity】Bluetooth FM Transmitter. Connect up to two Bluetooth enabled devices to the receiver and listen to music or answer phone calls from both devices. Our Bluetooth FM transmitter is compatible with Bluetooth V1.2/2.0/2.1/3.0/4.0/4.1/4.2 and can effectively avoid unstable connection problems. Three music playing modes (Bluetooth connection / 3.5mm AUX input cable / TF cards). 【7 Colors LED Light】The LED light will stay permanently on after successful Bluetooth pairing LED light Short press to change color. It can help you see clearly at night and make your car's interior layout more cool and attractive. 【Google Assistant Siri】The FM transmitter kit works faster and more conveniently with the intelligent Siri, which you can ask questions, make phone calls, etc. CVC noise cancellation technology also ensures clearer and quieter hands-free calls for safer driving and using this Bluetooth wireless transmitter. 【Quick Charge QC3 0】This FM transmitter supports charging 2