NoiseKICK FX Bleep Box

in good working condition.

From Noise Kick:

With the Bleep Box you can get a clean true bypass signal, then stomp on the momentary foot switch to produce a tone (sine wave). Adjust the frequency to your liking.

True bypass.
Completely handmade.
Uses a standard 9v plug. 
Approximate size is 4.77" x 2.6"