Ending today, Monoprice offers the Z-Wave Plus Recessed Door/Window Sensor for $19.99. Coupon code "RELAX" cuts it to $16.99. With free shipping, that's $3 under our mention from three weeks ago and the lowest price we could find now by $14. This sensor is designed to work with the Z-Wave Plus network and detects when a window or door is opened or closed.

Also available is the Z Wave Plus Door and Window Sensor for $19.99 before the above coupon, $16.99 after. With free shipping, that's also $3 under our mention from three weeks ago and the lowest price we could find. This sensor is designed to work with the Z-Wave Plus network and detects when a window or door is opened or closed.