Electricty Project - Mobile Phone Flasher Kit with 2 LEDs. A flashing LED module that responds to the radio signals from adjacent mobile phones. The module responds to either incoming or outgoing phone signals by flashing a 20 second light sequence through 2 LEDs. The module can also be used as an input module for other circuits. Built-in antenna. Powered by 2 x L736 (GP192) button cells (supplied).