This part is a kind of semiconductor called P181.

Function of this product has Snap-In Panel Mount LED Lamps.

Manufacturers : Ledtronicss

Image and pinout :

Some of the text within the PDF file :

Snap-In Panel Mount LED Lamps (4mm - 6.4mm); Page 1 Page 1 of 2 Why LEDs? Datasheets Order / RFQ Reps / Dists Medium Based Media Panel About Us Discrete Catalogs/Lit. Samples Site Map Survey Home Datasheet Home Miniature Based PCB SMT Custom&RGB SafetyLED LED Specs [ SEARCH ] Snap-In Panel Mount LED Lamps 5/32in. (4.0mm), 3/16in. (4.8mm), 1/4in. (6.4mm) click here to access pdf file of this page Snap-In and Bolt-On Panel Mount LED Lamps Pages: [5/32-1/4in. Snap-In] [5/16in. Snap-In] [1/4 - 5/16in. Bolt-On] [1/2in. 1-chip Snap-In] [1/2in. multi-chip Snap-In] Features Panel Mounting Diameters from 5/32" (4.0mm) to 5/16" (8.0mm) Long Life 100,000+ hrs (10 years) Solid-State, High Shock / Vibration Resistant Maintenance Free, Easy Installation Low Power Consumption, High Inte [ ... ]

P181 PDF Datasheet Download