Wireless Doorbell Kit
User Manual

AVANTEK D-3B Wireless Doorbell Kit

Congratulations on your purchase of our product. To ensure proper use and trouble-free operation, please carefully read this user manual first.


This wireless doorbell kit includes two CR2032 Lithium battery-operated transmitters and one plug-in receiver. It features 52 classic melodies with adjustable volume control to meet your needs. This wireless doorbell kit is a great addition to any home as it is easy to set up and operate.

Package Contents

1 x Transmitter (battery included)
2 x Plug-in receiver
1 x Adhesive tape
1 x Key
2 x Screw
2 x Anchor
1 x User manual

Product Profile

  1. LED on the receiver
  2. Volume button
  3. Previous button
  4. Next button
  5. LED on the push button (Transmitter)

AVANTEK D-3B Wireless Doorbell Kit -

Technical Specifications

Receiver working voltage AC 110 V — 260 V
Sound pressure level ≤ 115 dB
Receiver AC power consumption < 0.25 W (standby mode)
Working frequency 433.92 MHz
Transmitter battery type CR2032 3 V Lithium button cell
Operating temperature -20 °C — 60 °C
Battery lifetime up to 3 years


  1. Extremely low power consumption and a three-year super long battery life (10 —15 times uses a day).
  2. Easy to set up; press and hold the Volume button on the receiver for 3 seconds and the LED will blink; press the button on the transmitter to complete paring.
  3. 52 optional melodies; easy to choose between next and previous; built-in 29 mm stereo speaker delivers rich and crisp sound.
  4. Uses a power chip from American Power Integrations, offering a reliable maximum of 250 mA current.
  5. Provides a massive 300 m wireless distance range (depending on the operating environment).
  6. Custom encoded software communication method ensures better privacy and no interference from other devices.
  7. The transmitter is IP55 dustproof and water-resistant, fit for various outdoor environments.
  8. Memory function adds convenience. Every time you turn on the device after a power outage, it will still maintain your last set melody and volume level.


Transmitter battery installation

The battery is pre-installed in the transmitter. Insert the key into the allotted slot. Twist the key clockwise to open. Peel off the insulating film on the button cell then close the cover.

Note: please notice the polarity of the button cell when replacing the battery.

Transmitter installation

  1. Adhesive tape: apply the double-sided adhesive tape on the back of the transmitter. Remove the outer side of the tape and attach the transmitter to the desired location on the wall and press hard for 30 seconds.
  2. Screws and anchors: there are screw locator knockouts on the back of the transmitter; punch these out to allow the screws to pass through and fix the transmitter with the anchors in the desired location on the wall.

Operating Instructions

Pairing method

  1. Plug the receiver into the power socket.
  2. Press and hold the Volume button on the receiver for 3 seconds to enter pairing mode. The indicator will blink.
  3. Press the transmitter and the receiver will chime “ding dong” to indicate the pairing is complete.


  1. Press any button on the receiver or wait for 60 seconds to exit the pairing mode.
  2. The receiver has two indicator lights. One green and one red. The green is the default light and will illuminate in the first pairing. The red will illuminate in the second pairing. The two colors will alternate along with the pairings.

Melody selection

There are 52 melodies for the doorbell kit. Press the Next button for the next melody and the Previous button for the last one. You can easily choose your favorite chime tone.

Volume adjustment

There are five volume levels in total and the minimum volume level is silent. Press the Volume button to select a lower volume level. When the volume reaches its minimum, press the button again it would turn to the maximum volume.


  1. Please do not place this transmitter in areas close to metals.
  2. The working distance varies with the blockage from different ambient environments.
  3. Use this product properly to prolong its lifespan.
  4. Never repair the interior circuit to prevent destroying the inside electronic components.


Problem Cause Solution
The indicator on the transmitter does not light up. The battery insulating film has not been peeled off. Peel off the insulating film.
The battery is not properly installed. Take out the battery and install it again. Make sure the contacts are good.
The battery power is low. Replace with a new battery.
The receiver does not respond to the transmitter. Unsuccessful pairing Pair the transmitter and receiver again.

AVANTEK CW-21 Wireless Doorbell Kit - icon

Email: [email protected]

Documents / Resources

AVANTEK D-3B Wireless Doorbell Kit [pdf] User Manual
D-3B, D-3W, Wireless Doorbell Kit
AVANTEK D-3B Wireless Doorbell Kit [pdf] User Manual
DBD, 2AU4DDBD, D-3B Wireless Doorbell Kit, Wireless Doorbell Kit

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