I'm interested in buying sets which consist of the following: One miniature fm transmitter that plugs into an audio output to broadcast locally (inside a classroom) to half a dozen or so wireless speakers for language teaching purposes.

I have currently found ONE such item branded as TAKASHI MODEL -WS-12/4507 which is fine BUT it has only one speaker for each transmitter. Ideally I should have from six to eight hand-held speakers with low speaker output (for 4-6 students). The teacher will plug the transmitter to an audio source (for example a discman or MP3 player) and students will catch the audio in their speakers. This is to replace a high-cost language laboratory with a low-priced listening device for very poor schools in Colombia.