The device in itself deserves 4 and a half stars out of 5, the installation is simple fact, apparage as much, in seconds. The sound, thanks to aptX codec is very very good, the bass of my devices (also purchased from Amazon long ago) sounded clear and there is no audible loss of quality of the transmitted signal. Basically, a song of my Samsung S5 connected by cable or even with the AEA2700, there is no difference unlike BT before.
Note that I do not put 5 stars because there is no battery that would not have recourse to the mains connection and that in the box there is no cable jack male / male, Simply a classic RCA that ends in a jack male.
Finally, I therefore recommend this device that can revive any old stereo jack or RCA provided system.