1. retardant ABS shell, durable to use, and it looks simple and generous.2. Mechanical doorbell, can be used with doorbell switch.3. Wired power supply, convenient and practical for using.4. Wall-mounted installation, no need complicated tools, save time and effort.5. High power speaker, provides loud sound and strong penetration.Condition: Brand NewItem Type: Wired DoorbellInstallation: Surface MountSound Volume: 80-95dbColour:whiteMaterial:ABS Size:15x9.5x4.5cmPackage Contents:1 x Wired DoorbellOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.