Lighting Packet includes one MEGA LED - WARM WHITE, one Coin Cell Battery with Switch, one Coil Cell Battery & two shrink tube plus directions. I use this set up to light my smaller structure kit - White Rabbit Bakery, Mermaid Island, "On Island Time", The Dog House, The Cat Palace & Sign of the Black Cat.
Look at T220 listing for step by step pictures.
General steps to wire one of my structures show below - #1 Glue the Mega LED as shown to the center front edge of the Interior Box - #2 Stain a strip of white paper (if ceiling was stained) and use tacky glue to cover the wire (after you have threaded it thru the box back) - #3 Drill a hole thru the back of the Interior Box as close to the top corner as possible - #4 Thread the wire thru the hole - #5 Put a shrink tube over one of the RED wires and twist the 2 ends of the red wires together - IMPORTANT TO TEST THE CONNECTION PRIOR TO SHRINKING THE TUBES - DO THIS BY PUTTING BATTERY IN HOLDER & CLICKING THE SWITCH - #6 Slide the shrink tube over the twisted wires - #7 Use matches or lighter to heat the shrink tube so it tightens over the twisted wires - REPEAT with the 2nd set of wires - #8 Build the Battery Holder Box & glue to the back of the INTERIOR BOX. Coil the excess wire & place in Battery Holder Box
NOTE: You can shorten the wires before twisting together - they are coated so you need to lightly sand off the coating at the ends of the shortened wires - always test the connection before shrinking the tubes.