What to do if the sound is too low?
Please increase the phone volume first, if the volume is still too low, please increase the volume of the FM transmitter and then adjust the volume of the car speaker.
Adjust Steps: Phone→FM transmitter→Car speaker
Can I play youtube on this device?
Of course, as long as it is connected to Bluetooth, any APP on your mobile phone can transmit sound through the car audio
Does it consume battery if I leave it plugged in (when the car is off)?
No, it wont. Our bluetooth transmitter has 6 kinds of protection, you can use it with confidence and will not hurt your car