Features: <br>External wired door bell for security access control. <br>Featured with soft, loud and clear ding dong playing bell sound. <br>Connect to DC 12V power directly. Can be used for a long time. <br>Easy to install, wall-mounted or double-sided adhesive paste. <br>Switch is not included. A good replacement for the old and broken one. <br> <br>Specifications: <br>Condition: Brand new and high quality <br>Material: ABS Plastic <br>Color: As picture shown <br>Voltage: 12V DC <br>Operating Current: 20mA <br>Environment Temperature: -10℃-45℃ <br>Relative Humidity: 40%RH-90%RH <br>Installation: Wall-mounted or double-sided adhesive(not included) <br>Size: Approx. 8.6 * 8.6 * 2.5cm / 3.39 * 3.39 * 0.98in <br>Weight: Approx. 90g <br> <br>Wire Connection: <br>Red: + 12 V <br>Black: GND <br>Green: BELL1 <br>Yellow: BELL2 <br> <br>Package Included: <br>1 * Door Bell<br>1、External wired door bell for security access control <br>2、Featured with soft, loud and clear ding dong playing bell sound <br>3、Connect to DC 12V power directly. Can be used for a long time <br>4、Easy to install, wall?mounted or double?sided adhesive paste <br>5、Switch is not included. A good replacement for the old and broken one