








🔔 Elevate your entryway with smart, stylish chimes that keep you in the loop—rain or shine!
The AVANTEK Wireless Doorbell CB-21 offers a robust 1000 ft wireless range and IP55 waterproof rating, ensuring reliable performance in all weather. Featuring 52 melodies and 5 volume levels up to 115 dB, it allows personalized alerts for multiple entrances. With ultra-low power consumption and a 3-year battery life, plus easy no-wiring installation and expandable receivers, it’s the perfect blend of convenience and cutting-edge tech for modern homes.








| ASIN | B07KG9T886 |
| Batteries | 2 CR2 batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Best Sellers Rank | 12,831 in DIY & Tools ( See Top 100 in DIY & Tools ) 64 in Door Bell Kits |
| Brand | AVANTEK |
| Certification | CE, FCC and RoHS |
| Colour | Mini (Black) |
| Customer Reviews | 4.5 4.5 out of 5 stars (5,159) |
| Date First Available | 8 Jan. 2019 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Guaranteed software updates until | unknown |
| Included Components | 2 × Transmitters (CR2032 batteries included), 1 × Plug-in receiver, 2 × Adhesive tapes, 1 × Screwdriver, 4 × Screws, 4 × Anchors, 1 × User manual |
| Item Weight | 190 g |
| Item model number | CB-21 |
| Manufacturer | AVANTEK |
| Material | ABS |
| Package Dimensions | 13.2 x 9.4 x 6 cm; 190 g |
| Part Number | CB-21 |
| Power and Plug Description | AC & Battery |
| Special features | ① Wireless Doorbell ② 2 Remote Buttons Can Have Different Tones, Suitable for Front Back Doors Entrance Ways ③ IP55 Waterproof Dustproof ④ 1000 Feet/300 M Operating Range ⑤ 5 Adjustable Volume Levels with 52 Chimes ⑥ Mini Sized ⑦ Electrical Doorbell |
| Specific Uses | All of the following AVANTEK doorbells with plug-in receivers can be paired with each other: CB-11/CW-11/CB-12/CW-12/CB-21/CW-21/D-3B/D-3W/D-3G/D-3F/D-3C/DB-21/DB-11/DW-21 (For orders purchased before 2021, it is best to contact us to inquire whether they can be paired.) |
| Voltage | 3 Volts |
A**R
Very simple setup
Excellent product that works exactly as intended. We live in a townhouse so the family room is upstairs. Our doorbell worked occasionally and most deliveries came to our back door which didn't have a bell. This meant we missed most parcels. Enter this AVANTEK setup. Two bells with adhesive pads and one receiver. Receiver is loud and small, set to a normal bell as default and the pairing process took seconds. I got what I wanted and I am delighted. Colour is also pleasant on my grey UPVC doors. Can't comment on battery life as it's just been installed, but it really was so easy to setup and use.
D**S
Better than expected
With so many makes/types to choose from it was difficult to narrow this purchase down. My main requirement was 2 transmitters (bell push) and 2 plug in receivers. I could find this option so settled for 2 transmitters and 1 receiver. I then ordered an additional receiver separately, hoping they would all talk to each other. They arrived in 2 separate deliveries. Both arrived promptly in neat packaging, though there were no instructions with the separate receiver. The installation instructions were OK but the instructions for Transmitter battery installation were poor. Trying to insert the metal key to remove the back cover of one of the transmitter was extremely difficult. I though the plastic was going crack before before it would open. Finally the cover did open. Looking at the battery compartment, I noticed what appeared to be a metal cover over the battery. I assumed you had to remove this cover to release the battery when in fact you slide the battery out from underneath the cover. Pairing the receivers and transmitters was straight forward though I was dubious the the receiver I purchased separately would actually be paired. All worked fine. Volume was very good (I'm hard of hearing). I also tried one receiver in my garden shed and it worked fine. It takes a lot to impress me but these did a very good job. Would recommend.
S**D
Smart modern door chime
This is a neat little door bell. Purchased the one with 1 chime and 2 bells. Very easy to set up,, and was able to back and front doors different sounds. The chime doesn't take up too much space. Only negativity is I found some sounds are a bit 'tinny'. There are 52 different sounds to choose from, but once you set 1 bell, you automatically go back to the beginning of the sounds before you can set the 2nd one. Be warned, when you plug in the chime, the first sound you will hear is a very loud 'cock-a-dooodle-do'. The bell push can be screwed to the door frame/wall or attached with sticky pads which are supplied.
G**G
Very easy to fit
Works perfectly, straight out of the box. Had mine for a couple of months now. Here's my thoughts.... Pro's: 1. Easy to fit (very easy. double sided tape is great on upvc doors, screws if using on brickwork) 2. Easy to setup. There are 2 bell pushes which can have different sounds, so you know back or front door etc. 3. Very weatherproof - a weakness of many other types. Con's 1. Nowhere near the claimed 300m range. Works fine in the house but a test showed it ran out of steam at just under 100m. 2. Ours stopped working. When I prised the bell push off the base, I noticed the little battery had slipped down inside it's holder, breaking contact. Pushed back up and added a tiny bit of blu-tack fixed this. All in all, it's the best wireless doorbell i've fitted in years and I'm an Electrician who's fitted dozens.
J**K
Easy To set up
Great little product, works well. Blue tooth connection great. So easy to install, for anyone to do.. just take out of the packet.. put one part on a plug somewhere in the house, then just stick up the actual bell on the outside, choose your tune, and its done! Great job, good price!
S**Y
When you have two doors that need a door bell
We have two doors, the main front door that is not used often and the side door that is used all the time, as such needed two door bells. This product does the job, its cheap, it works, it is easy to install with adhesive strips for the door buttons, the chimer plugs in to the wall and is loud enough to hear around the house.
P**E
Easy to set up
Great door bell kit. 2 push bells so I can have on the front and back doors. Loud enough to hear around the house with one receiver. Good mix of tunes to pick from. Pads to stick the bells to the door are strong. So far so good .. no problems with set up - easy
S**.
5 star
Great bell works exactly as it should.
Trustpilot
1 week ago
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