Here's a fun kit that won't go unnoticed by people in a room. Press the arming button and the kit gives you about 44 seconds (give or take) to get away before an electronic tone sounds and the number 44 lights up on the bright red display! Uses a unique circuit consisting of two transistors and a special shunt regulator. Operates from a 9V battery (not included). Size of PC board: only 1 7/8” square!

Complete with all parts, PC board and instructions. Skill Level 1.

This kit provides an interesting, economical and fun way to introduce students to digital displays, semiconductors, etc.