ZXD41 Door Sensor Product Features: 1. Instant Notification. instant notification to your phone immediately when door or window is opened or closed. Keeping you informed all the time. 2. Sound Alarm ( Volumn adjustable) Whenever the sensor is triggered to open/, it will make alarm sound to let you notice 3. Alarm Recording Support checking open / records and battery level on the app. Never worry about missing any important moments or running out of battery. Device Share (can share to 5~7 users) Select "Home Management" in the "" page to share your added sensors with family members. so that they can also monitor the status of doors/windows. Low Battery power Remind When battery level is low, it will automatically remind you to change batteries, never worryabout running out of battery. Works with amazon and Google Assistant (Tuya app or Smart Life APP ZXD41 Door Sensor Specification App/Platform: Tuya / Smartlife APP Works With: Google assistant and Amazon OS Support: IOS8.0 / Android4.0 and above Wi-Fi Band: 2.4GHz Standby Current: Less than 35uA Alarm Current: Less than 100mA Battry: AAA x 2 Battery (no Included) Operating Temperature: -10~+55 WiFi Smart Alarm Door Sensor Information / High decibel alarm / Record Query Adjustable Volume / Low battery reminder / Intelligent linkage color: White : ABS Package Contents: 1 x tuya wifi door/window sensor (no battery) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.