Superb wireless microphone entry level, it is sold under different brand, but at prices varying according to the notoriety of it.
Made in China, they have a good sound, but subject to the effect "POP", it is necessary to properly orient the microphone during use.
It is available with handheld microphone or headset comes with a handy light.

Pdf + Technical
http://francismerck.free.fr/audiophony.html