"Here's just what you need to complete your home, an electronic cricket that starts ""chirping"" every time the lights go out. Of course if you turn on the lights to look for the ""cricket"", it becomes silent again. Uses a CMOS IC and CDS cell circuit with an adjustable ""cricket "" sound control, that enables you to adjust your cricket to the chirp that you find most irritating. Simple to build and loads of fun to use. Your electronic cricket is sure to get the attention it deserves. Operates from a 9V battery (not included). Size of the PC board: 1 7/8'' x 2 1/2''. Complete with all parts, PC board and instructions. Skill Level 1. "