<p>1. High performance: Smart USB Doorbell has ultra-low power consumption, long service life, and a working temperature range of - 20-70 , which can withstand adverse weather conditions.</p> <p>2. Modern and Practical Design: Our Wireless Doorbell has a fashionable appearance and practical functions. and sensitive, it can be remotely controlled, providing you with quick instructions to that you hear and open the a timely manner.</p> <p>3. 30 song Ringtones: SOS Button Doorbell has 30 song ringtones to choose from, and you can choose your favorite music.</p> <p>4. Easy to Install: The Mini Door Bell is easy to install and can be installed in just a few minutes. The receiver can be placed with screws</p> <p>Doorbell Receiver</p> <p>Name: Wireless doorbell receiver</p> <p>Music quantity: 30 pieces</p> <p>Output mode:horn</p> <p>Demodulation : ASK</p> <p>Control : equipped with remote control</p> <p>Working voltage: DC5V\/1A</p> <p>Doorbell Transmitters</p> <p>Name: Single Button Remote Control</p> <p>Operating frequency: 433MHz</p> <p>Battery type: button battery 2016 * 3</p> <p>Modulation mode: ASK</p> <p>Encoding format: EV1527</p> <p>Colour:White</p> <p>Material:ABS</p> <p>Package Contents:</p> <p>1 x controller</p> <p>1 x receiver</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>