This useful kit includes all of the features you would expect from a professional burglar alarm. It uses an IC circuit and has an exit time delay to allow you to leave your home before the unit is armed, an entrance delay to allow you to disarm the unitwhen you return home, an automatic horn cutoff after a period of time, an automatic reset circuit, and of course, N.O. and N.C. loops to allow you to use your choice of optional sensor switches, such as reed switches, snap action switches, etc. Operatesfrom two 9V batteries (not included). Comes with 9V horn, but if you wish, you can activate your own horn alarm if you have one. Size of PC board: 3.25" x 2.65". Complete with all parts (except sensor siwitches), PC board and instructions. Skill Level 2. C6703 Manufactured by Chaney Electronics