Monoprice offers its Z Wave Plus Door and Window Sensor for $19.99 shipped when code ZWAVE is used at checkout. You’ll also be able to score the Z-Wave Plus Recessed Door/Window Sensor for the same price by applying the code at checkout. That saves you 20% on both sensors, dropping the the price by $5. Both share a 4+/5 star rating.
Z Wave Door and Window Sensor Features:
This Z-Wave Plus® Door/Window Sensor mounts to a door or window, detects when it is opened or closed, and sends a Z-Wave trigger signal to the network. It also has a tamper-proof switch, which will trigger a Z-Wave signal when the sensor’s cover is removed. These trigger signals can be used to activate various other devices and perform preprogrammed tasks. When the sensor is included into a secured Z-Wave network, all communications will be encrypted using AES encryption.