One Doorbell, Four Functions
The Only 4-in-1 wireless doorbell meant to address
four basic needs with just one device

BELL by SadoTech

The First 4-in-1 Multipurpose
Wireless Doorbell

Designed for Teachers, PWD, Business and Home Care

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One Doorbell Four Functions

For four years, SadoTech has worked to create quality products that provides modern, state-of-the-art, and easy-to-install wireless doorbell alert systems that are suitable for both indoor and outdoor use – such as pet doorbells, motion sensors, and expandable wireless doorbells. Our latest product BELL is a device that serves FOUR FUNCTIONS: a doorbell, an emergency alert system for PWD or health-care assistance, class management tool, and business alert tool.

As Seen On



How Does it Work?

Our BELL 4-in-1 Multi-Purpose Wireless Doorbell is composed of three interchangeable devices: The Transmitter, The Vibrating Receiver, and the Plug-in Receiver. The transmitter is the button that will be linked to both the receivers. Whenever someone presses the button, both of the receivers will ring simultaneously. The vibrating receiver has the option to vibrate and can also be used as an alert device for the hearing impaired.


Special Features

  • Added Alert Security

  • Low Power Consumption

  • Weatherproof and Waterproof

  • 50+ Chimes to Choose From

  • Switch to Quiet Vibration Mode

  • Four Volume Levels

  • Expandable Devices

  • Portable & Wearable

  • Mountable and Detachable

What’s New?

So what makes the BELL doorbell alert device different from the current products in the market?

  • Waterproof / Weatherproof

    Our new Silicone-Covered Transmitter Button secures the transmitter device inside and out. It covers both the front and the back part of the device to ensure maximum protection against any type of spillage.

  • Wearable and Handy

    The new doorbell transmitter comes with a detachable neck lanyard strap that can be easily removed in case of emergency.

  • Mountable and Detachable

    When the transmitter button is not worn around the neck or used as a handheld device, you can also mount it on the wall using our newest wall-mount clip. The grooved moldings on the side of the transmitter can now be hooked onto the wall clip by simply sliding it in.

  • Mountable and Detachable

    Once you are done using the transmitter button as a necklace or a handheld-device, you can simply mount it against the wall with the help of our newest wall-mount clip. The newly curved moldings on the side of the transmitter can now be hooked against the wall clip, by simply sliding it in.

  • More Chimes to Choose From

    We have heard your request! Our newest doorbell has more specially curated classic doorbell and alert chimes.

  • Longer Battery Life

    No need to keep changing those batteries all the time! Our newest energy conserving technology can prolong battery life and have your device working for longer periods of time.  

How Will it Help?

  • No More Missed Deliveries

  • Be Alerted in Case of Emergencies

  • Switch to Vibrating Mode for the Hearing Impaired or During Quiet Time

  • Avoid Long Complicated Installation Process

  • Never Miss Someone at the Door

  • For Teachers: Classroom Management without Yelling

Limited Edition Midnight Black

Yes, we heard your plea for color variations and we are more than happy to oblige. Get this limited edition midnight black doorbell only here at KickStarter, for a more modern contemporary look!