The MDC Series is a discreet miniature door sensor that monitors the irregular opening / closing of doors and windows. The MDC Series is particularly small, which allows for highly flexible and virtually invisible installation. The MDC Series leverages Vesta’s cutting-edge F1 technology to accelerate the speed of signal transmission and deliver extensive, reliable RF communication range, allowing users to stay in touch, in control, and provide a peace of mind.Integrating MDC Series into a security or home automation system will allow users to create scenes and automatically control lights and electronic appliances when doors or windows open and close. The MDC Series features a pre-inserted battery with minimal power consumption, and transmits supervisory and low battery signals to check system integrity.MDC-3 model has a slightly larger housing to case a more powerful battery for increase prolonged battery life. Technologically advanced and slim design, the Mini Door/Window Contact Series stands out as a broadly applicable device ready to make users home or business safer and smarter.