12 volt AC Adapter works with Smart Caregiver Cordless Alarm Monitor 433-EC (latest version sold beginning in 2016) and Motion Sensors 433-MS and TL-5102MP. (433-EC sold as part of packages "Wireless (Cordfree) Bed Alarm and Bed Pad/no Alarm in Patient's Room", "Cordless, Wireless Alarm With Both bed & Chair Pads (No alarm in patient's room)", "Smart Caregiver Economy Wireless Monitor & Motion Sensor", "Cordless Floor Mat (No Alarm in Patient's Room)", "Motion Sensor with Remote Alarm", "Call Button & Remote Alarm", and "Cordless, Wireless Bed Alarm Alert System - No Alarm in Patient's Room", among others). Contact seller before purchasing if you own a 433-EC purchased at the beginning of or prior to 2016, as you likely need a different version of this 12 volt adapter.