Feature:1. No Battery Required: It is sufficient to connect the DC12V access control power supply, no doorbell battery is required.2. Easy to Use: After connecting to the access control system, press the doorbell button and the doorbell will make a pleasant sound.3. 90dB Volume: 90dB high loudness doorbell, and the sound is clear, not afraid to hear and miss important people or things.4. Premium Quality ABS: The material is flame retardant, fire proof, high temperature resistant, and can be used for a long time.5. Extensive Application: The classic wired doorbell can be used in hotels, homes and other places where you want to install.Specification:Item Type: Wired DoorbellMaterial: ABSVoltage: DC 12VVolume: 90dB.Package List:1 xWired Doorbell