Brand: WYZEFeatures: Requires Wyze Home Security System Core Kit. This device will NOT function as an individual or standalone product. Place the Wyze Contact Sensor on doors and any ground floor windows to be notified if one is opened or left open. Fully Wireless 18 month battery life. Works with Alexa routines. Open/closed detection and left open alerts. Binding: ElectronicsRelease Date: 15 06 2021model number: WSES2 3PKPart Number: WSES2 3PKDetails: Requires Wyze Home Security System Core Starter Kit. This device will NOT function as an individual or standalone product. Place the Wyze Entry Sensor on doors and any ground floor windows to be notified if one is opened or left open. EAN: 0850025015271Package Dimensions: 2. 4 x 2. 3 x 1. 9 inches