Miniature LED Driver, 2.3mA Constant Current

This miniature (23mm x 10mm) LED Driver is perfect for fitting in small spaces.
such as Model Railroad rolling stock (passenger cars, cabooses)in N scale and larger.

Also fits nicely inside many types of dollhouse furniture 

Constant current output of 2.3mA - gives constant light levels

Input is 0 to 30 volts, AC, DC or DCC, with light level being constant from around 4-30 volts
Will  keep a white LED alive for about 2 seconds on loss of DCC power
(Dime and caboose not included)

How many LEDs can I power?