Item Type: Audible Alarm_x000D_ Voltage: 5V_x000D_ Current: 1A_x000D_ Batteries: 2 CR123A Batteries (not included)_x000D_ Volume: 90db (Maximum)_x000D_ Wireless Frequency: 2.4GHz_x000D_ Wireless Distance: 55m_x000D_ Communication Protocol: for Zigbee3.0_x000D_ Network Protocol: for Zigbee IEEE802.15.4 1Convenient 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. 2APP 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. 3Intrusion 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. 4High 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. 5Support Family Sharing: You can view your records remotely on the APP, or you can share your device with family members for remote controlShipped Without Battery1 x Audible Alarm 1 x Instructions 1 x Expansion Tube 1 x Screw 1 x Double Sided Adhesive Tape 1 x Power Cord