While standard handheld microphones are generally used for most public address (PA) applications, there are times when a lapel microphone is much more convenient. A lapel microphone not only frees up a user's hands but also allows the wearer to roam about easily. They are ideal when giving talks and lectures, and for certain types of theatre work.

Another advantage of lapel microphones is that they provide a reasonably consistent output, even when the person speaking turns their head. That's because a lapel microphone is usually clipped to the user's clothing around the chest area and so remains at a similar distance from the mouth regardless of head movement. By contrast, hand-held microphones must always be held close to the mouth, otherwise the signal level will vary drastically.

Lapel microphones are generally available in two forms. By far the most common form for PA use at the present time is the radio microphone. This consists of the lapel microphone itself plus a small radio transmitter which is worn by the user - eg, inside a shirt pocket or by attaching it to a belt. The signals from the transmitter are picked up by a corresponding receiver which then feeds the signal to the PA system.

The big advantage of the radio microphone is that it allows the user to roam freely over several tens of metres without being tethered to a lead. However, this freedom comes at a high cost, with complete radio microphone systems typically costing around $600.

Main Features Uses standard electret lapel microphone Adaptor attached to belt or in pocket Battery powered (9V) Balanced output Muting facility Battery indicator