This is a directional LED replacement bulb for use in any DC bayonet reading light.
It has an output of 40 lumens which is equivalent to a typical 18W incandescent bulb.
The Magnum Ring is available in several styles: single and double contact styles - both indexed (BAY) (with off-set pins) and non-indexed (with opposite pins).
This is the non-indexed ("standard") style.

Soothing, warm light; no burns - warm to the touch
Replaces BA style (15mm) incandescant double contact bayonet bulbs used in many boats and RVs
11 - 15 VDC; no RF noise; gold-plated contacts
10,000+ hour service life, with no filament to burn out or break
Not recommended for use in fixtures with colored lenses (colored lenses should have colored LEDs)
In-line regulator (sold separately) allows use with 24 volt systems; use one regulator per fixture