Make: Boss
Model: PN-2 Tremolo/Pan (Silver Label)
Box: None
Power Supply: Not included
Condition: Heavy relic! It was recently gone through and recapped by Haggtronix. It's been modded, but we don't know what exactly was modded besides the green LEDs installed for the rate and check indicators. It trems and pans as expected though! Very cool find. These were only manufactured for a few years in the early 90s before Boss introduced the TR-2

 
From the owner's manual:

Thank you, and congratulations on your choice of this product. To make sure you get the most out of the PN-2 TREMOLO/PAN and enjoy continuing satisfaction as a result of operating it under the best of conditions, please thoroughly read thease instructions.

• The PN-2 TREMOLO/PAN is an effects unit which creates effects that pan the sound to left and right, as well as applies periodic changes in the sound's volume to produce a tremolo effect.
• The unit makes stereo output possible for instruments having only monaural output, through use of the Panning effects.
• Since the unit is also equipped with stereo inputs, the Panning/Tremolo effects can be used for instruments such as keyboards equipped with stereo output.

Specifications:

• Power Supply: 9V DC Battery, PSA Adaptor
• Current Draw: 20mA (9V DC)
• Controls: Depth, Rate
• Switches: Mode (PAN, TREMOLO), Effect On/Off
• Indicators: Rate, Effect On/Off (serves also as battery check indicator)
• Jacks: Input A (MONO)/B, Output A/B, AC Adaptor
• LFO Rate: 130ms to 14s
• Residual Noise: Less than -90dBm (IHF-A)
• Input Impedance A/B: 1Mohm (MONO: 500kohm)
• Output Load Impedance: More than 10Kohm
• Dimensions: 70(W) x 55 (H) x 125 (D) mm; 2 3/4" x 2 3/16" x 4 15/16"

Got questions? Shoot me a message, I love nerding out with other gearheads!