Level quality, the sound transmitted to me is more than enough and it's true that in total silence we hear a slight hiss. Anyway, consider this object to its place of use is the car, the light breath is covered by engine noise.
Otherwise, this model has a dual transmitter output cable. There is obviously the Jack cable but also a micro-USB cable. So it can charge a laptop (Samsung in my case) while leaving the USB jack on the cigarette lighter. The latter can thus be used to connect his GPS.
There, for 10 euros is really the best features / price of the moment.