Check the listing for details. SMPL Wander Alert Add-On Motion Sensor. Condition: New. Listed at 37.99 USD. Be alerted day or night to movement in high risk areas such as stairway halls and bathrooms. By purchasing additional Motion Sensors that are easy to set and pair with your existing Wander Alert Motion Sensor Kit (HC-SMPL/WA-MSKIT), you can monitor multiple areas. Strategically place them in the home areas that are necessary for you to be notified immediately of someone's movement for the quickest response time. Change the chimes and alarms to signal which area's are alerting. The Add-On Motion Sensors can be purchased with a kit or the sensors and alarm/receivers can be purchased separately to expand monitoring points. Easy to set and pair additional sensors!FeaturesMotion Sensor detect movements (activity) within 20 ft. in any monitored room or area. Sensor triggers portable Alarm/Receiver up to 250 ft. away. Alarm/Receiver will vibrate, light up and play melodies. (sold separately).Low cost solution - no Wi-Fi or monthly fee required. Utilizing low power consumption Radio Frequency technology - Battery operated and wireless. Simple installation. Expandable; can Add-On sensors and portable alarm/receivers (sold separately). One year warranty.