Until now, such FM transmitters have had to be licenced, but PTS wants to abolish the requirement.
The issue first arose a few years ago when importers wanted to sell mp3 players with built-in FM transmitters in Sweden. PTS considered that the risk of interference was too great and, despite protests from the electronics industry, banned the use of such devices.
The point of an FM transmitter in an mp3 player is to allow music stored on the device to be played through a car radio or a home sound system with a radio built in.
Since the blanket ban, a study into the interference effects of the devices has been carried out. The result shows the risk of interference is very small. Meanwhile, there are now European regulations governing the specifications of this kind of transmitter.
The device should carry the CE mark and the transmission effect should be a maximum of 50 nanowatts.
PTS said that the first products with the built-in FM transmitters will be sold in Sweden in the autumn.