Item Type: Wired Doorbell Material: ABS Application: Suitable for family, hotel, building Working Power Supply: Voltage: 12V DC Operating Current: 20mA Ambient Temperature: Working: -10 - 45 Relative Humidity: Working: 40%RH - 90%RH Package List 1 x Wired Doorbell 1Using highquality ABS shell material, fireretardant, sturdy and durable, long service life. 2This doorbell is designed with a builtin speaker. Once someone presses it, it will emit a loud ringtone, and you can hear it at home, and you don't have to worry about missing visitors. 3It adopts wired design, no need to buy any battery, just use the access control power supply, which is environmentally friendly, convenient and costsaving. 4This wired doorbell is very convenient to operate and install. Wall hanging or doublesided adhesive paste installation(not include doublesided adhesive). 5Suitable for family, hotel, building. It is an external wired doorbell used for secure access control.