The PA-5 by Hamilton Electronics is a handy little device used by teachers and more.  This portable PA attaches to your waist for portability:

Instead of raising your voice let the Waistband Amplifier do it for you. This handy device is great for school programs, sporting events, field trips, assemblies, lunch or playground duties.

Snap the powerful yet lightweight amplifier around your waist and put on the headset microphone for hands-free public speaking.

* Snaps securely around your waist for hands-free public speaking
* Includes headset microphone and Lavaliere Mic
* 5 watt powerful and lightweight design
* Uses 6 AA batteries (not included)
* 1 year warranty
* Weight: 5lbs 

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