It makes sense to upgrade devices with Bluetooth

Equal first, Bluetooth does not replace any cable connection and is always dependent on the equipment used and the distance between transmitter and receiver!
Use this small "part" in order to make use of devices without Bluetooth on my Bluetooth headset can (older MP3 player, the PC as well as the new Samsung Smart TV). The only requirement is an audio-out jack 3.5 mm. If the connection is made - everything works as desired. So I can my older MP3 player while jogging good use without cumbersome cables restrict the freedom of movement. The togetherness at home is restored, I can look at my "Men's films" undisturbed and without hearing what I have to sell my book reading friend of the couch ;-)).
The unit is supplied in a neat package and contains the transmitter a micro USB cable, a coupling RCA to 3.5mm stereo plug and an instruction manual. If you follow this, nothing can go wrong. It is recommended to charge the sender via the USB cable. However, it is also possible to charge in parallel with existing USB port on the transmitter during transmission. Somewhat more complicated is the coordination between the transmitter and the Bluetooth headset: When switched off you put the transmitter and the headphones next to each other (max 90 cm.). Then you push the button on the transmitter (about 6-7 sec.) Until the lights flash red / blue alternately. Now you only have to switch to receive mode and even the connection is established the headphones according to the manufacturer's instructions. It is handy that, see, when the transmitter is the transmitter and the headphones without retuning easy when switching back. Not least, the supplied RCA clinker clutch is justified for devices that have no headphone output but only one RCA Out output.
Conclusion: If you want to use all still well-functioning "Old devices" via Bluetooth is well supplied with the stereo transmitter, so clear recommendation