Feature:1. Convenient Installation: Easily set up this wireless home security alarm in minutes. Just plug into any electrical outlet with the power cable and screw onto wall.2. APP Remote Control: Download the specific APP for this smart alarm, and directly control the smart audible alarm through your mobile device. Features include scheduling and automatic push notifications which give you control while you're out and about.3. Intrusion Alarm: Our smart alarm can be linked with other smart home devices, and it equipped with an intelligent person presence sensor, and once an outsider is detected, the alarm will automatically sound the alarm.4. High Decibel Alarm: There are 18 alarm bells to choose from. Choose your own according to your preference. The maximum volume of the alarm can reach 90db, which is very noticeable even from a distance.5. Support Family Sharing: You can view your records remotely on the APP, or you can share your device with family members for remote controlSpecification:Item Type: Audible Alarm.Voltage: 5VCurrent: 1ABatteries: 2 CR123A Batteries (not included)Volume: 90db (Maximum)Wireless Frequency: 2.4GHzWireless Distance: 55mCommunication Protocol: for Zigbee3.0Network Protocol: for Zigbee IEEE802.15.4Package List:1 x Audible Alarm1 x Instructions1 x Expansion Tube 1 x Screw 1 x Double Sided Adhesive Tape 1 x Power CordNote:Shipped Without Battery