I used this a few times in the church band I used to play in occasionally. It worked well but I don't need it anymore.
Here's the basics:
Behringer Powerplay P1 Personal In-ear Monitor Amplifier Features:
High-powered headphone output with limiter protects your ears; loud enough for drummers
Dual XLR inputs, mono or stereo operation, and Level and Balance controls give you control over your monitor mix
Convenient belt-clip and 9-volt battery with dual LED capacity indicators keeps you grooving on stage
Use with an optional power supply and mount on a standard mic stand for a permanent studio monitoring station
Comes with the original box and instructions.
$35.00 plus $5.00 shipping in the lower 48.
'69 Emmons P/P, '73 Emmons P/P, MSA Millennium, Legend, and Studio Pro, Reese's restored Universal Direction guitar, the MSA Classic plexiglass steel, as well as several older MSAs, and a bunch of amps, new and old.