Uses three transistors and two LED circuits to make decisions or replace coin tossing. Features one red and one green LED that flash at a high frequency when the sensor wires are touched. When you stop touching the sensor, your decision is shown by the LED that remains on. Has control to adjust the odds. Operates using a 9 V battery, sold separately. Complete with all parts, PC board, and instructions. Size of board: 1.6" x 2.2".