Step 1: The Circuit
It is 2 circuits with switch and battery+light together.
The highlighted section is were it is in the phone cable.
when you connect through the cable using phone cable connectors (see picture)
to make it plug in, make sure to check the wires cause the colours-signal changes because of these connectors.
Step 2: Pictures of the Plug-in System
Step 3: Closing Up
I used 2 plastic kid safes for casing.
make sure the phone cord sticks out. when both are in boxes you can connect them and play with it.
Step 4: Play With It!
--● --- --- -●● -●●● -●-- ●!
what means: goodbye!