General description Quality flame-retardant ABS shell, easy to use, simple and generous. The mechanical doorbell can be used with most doorbell switches. Wired power supply makes it convenient and practical to use. Wall-mounted installation requires no complicated tools, saving time and effort. High-power speaker provides loud sound and strong penetration. Technical specifications Condition: Brand New Item Type: Wired Doorbell Sound Volume: 80-95 dB Color: White Material: ABS Size: 15 x 9.5 x 4.5 cm Package Contents: 3 x Wired Doorbell Measurement allowed error: +/- 1-3 cm