Simple home alarm door alarm magnetic contact alarm alarm alarm door sensor alarm

About Product:This paragraph door magnetic alarm is currently price Supreme, practicality strong, family anti-theft or shops anti-theft, are very with practicality, products principle simple, performance quite stable, no complex of circuit, only using magnet part near and left subject part Shi, glass tube of metal tablets separate and contact, to reached circuit of connected and disconnect of role, dang circuit connected Shi subject part Horn issued 90 dB of alarm sound, thus reached reminded master prevention and scare ran criminals of function!