1、High quality wired doorbell is perfectly applicable to security access control system. 2、With 90db loud doorbell chime, easy to be heard when someone is pressing the doorbell for access. 3、Low power consumption, long standby time, direct connection to DC 12V power supply. 4、Compact size, light weight, wall-mounted installation is simple and convenient. 5、Manufactured with premium plastic material, practical and durable. Features: High quality wired doorbell is perfectly applicable to security access control system. With 90db loud doorbell chime, easy to be heard when someone is pressing the doorbell for access. Low power consumption, long standby time, direct connection to DC 12V power supply. Compact size, light weight, wall-mounted installation is simple and convenient. Manufactured with premium plastic material, practical and durable. Specification: Condition: Brand New Material: Plastic Color: White Power: 3W Power supply voltage: 220V Direct connection: DC 12V power supply Doorbell volume: 90db Working voltage: DC 12V Wiring: 2 wires are connected to 12V power line (red-12V(+); black-GND( - )); another 2 are connected to bell. Package List: 1 * Doorbell