WARNING! This is an AC powered device and is not recommended for circuit-bending. DO NOT ATTEMPT unless you absolutely know how to work with AC power! IMMINENT RISK OF DEATH!!!
A Radio Shack Realistic FM Wireless Room Monitor. Modified with a screech knob, audio output, and photocell input for optical control of screeching.
Back label. Heed the CAUTION if you don't know what you're doing!