Swann SWO-WDS1PA-US One Window/Door Sensor (White) DETECT ENTRY; Detects open & closed status, with magnetic sensor on either side of door & window frames ALARM TRIGGERS; If the magnetic sensor is disrupted an audible alarm can be triggered^ & an alert is sent to your Smartphone TEMPERATURE INDICATION; Measures & reports on the room temperature in your home EASY SET UP; Fitted with a 3M Command strip & uses 2 x AAA batteries (included) to enable easy installation & relocation. No drilling, no holes! MOBILE ALERTS; Receive alerts & status updates on your Smartphone when paired with a SwannOne Smart Hub