Review on Wireless Car FM Transmitter with Bluetooth, Dual USB Ports, AUX Input/Output and Voice Navigation - MP3 Player Hands-Free Car Kit, Radio Audio Adapter for U Disk, TF Card, Folder Playback by Alex Reunion

I just got this in the mail, took it to my car and installed it and started it up in 30 seconds. It's great for $20 because it has an on/off switch, which is great since I no longer have to unplug it. Just press and wait 5 seconds and turn off. This is an updated version with BT 5.0, not 4.1. She's loud enough. I'm not sure if all the reviews here say the volume is too low. You understand that you need to turn the volume up to 31 on the device and then control the volume through your car's head unit. It comes with an extra cable so you can use it that way and also the TFT reader works fine if you're old school and want to listen to music from a memory card. It charges your phone, but slowly. I bought it to not charge my phone. I bought it for music streaming via BT. It is not intended to replace your car radio. It was designed to improve and complement older cars that didn't have an extra cable or BT connectivity built into the head unit. People who complain about this either have no idea how to deal with it. They expect it to work like a $500 car radio. That he shouldn't. As for hissing, I can't hear anything on mine between songs or even while a song is playing. There is always a frequency that you can find in your town/municipality that will give you optimal results. Feel free to buy this as it's a great transmitter! The only thing I could say might be questionable is the lighting configuration. They either had to make the backlight all red or all blue. I'm very glad I bought it as it replaces my old BT 4.0 transmitter which had no on/off function. One final note: it makes very good hands-free calls. People say I don't speak on speakerphone and my voice is clear as is theirs.