Feature:1. Using highquality ABS shell material, fireretardant, sturdy and durable, long service life.2. This 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.3. It adopts wired design, no need to buy any battery, just use the access control power supply, which is environmentally friendly, convenient and costsaving.4. This wired doorbell is very convenient to operate and install. Wall hanging or doublesided adhesive paste installation(not include doublesided adhesive).5. Suitable for family, hotel, building. It is an external wired doorbell used for secure access control.Specification:Item Type: Wired DoorbellMaterial: ABSApplication: Suitable for family, hotel, buildingWorking Power Supply: Voltage: 12V DCOperating Current: 20mAAmbient Temperature: Working: -10 - 45Relative Humidity: Working: 40%RH - 90%RH.Package List:1 x Wired Doorbell