Features:

• 
  External wired door bell for security access control.

• 
  Featured with soft, loud and clear ding dong playing bell sound.

• 
  Connect to DC 12V power directly. Can be used for a long time.

• 
  Easy to install, wall-mounted or double-sided adhesive paste.

• 
  Switch is not included. A good replacement for the old and broken one.

Specifications:
Condition: 100% Brand new and high quality
Material: ABS Plastic
Color: As picture shown
Voltage: 12V DC
Operating Current: 20mA
Environment Temperature: -10℃-45℃
Relative Humidity: 40%RH-90%RH
Installation: Wall-mounted or double-sided adhesive(not included)
Size: Approx. 8.6 * 8.6 * 2.5cm / 3.39 * 3.39 * 0.98in
Weight: Approx. 90g

Wire Connection:
Red: + 12 V
Black: GND
Green: BELL1
Yellow: BELL2

Package Included: 
1 * Door Bell