---
product_id: 683478803
title: "Wireless Doorbells, 1000 ft Range IP55 Waterproof Cordless Door Chime Kit with 2 Push Buttons, 52 Melodies, 5 Volume Levels, LED Flash, CB-21, Suitable for Front Back Doors Entrance Ways"
brand: "avantek"
price: "₨28128"
currency: LKR
in_stock: true
url: https://www.desertcart.lk/products/683478803-wireless-doorbells-1000-ft-range-ip55-waterproof-cordless-door-chime
store_origin: LK
region: Sri Lanka
---

# IP55 waterproof & dustproof 1000 ft wireless range 3-year battery life Wireless Doorbells, 1000 ft Range IP55 Waterproof Cordless Door Chime Kit with 2 Push Buttons, 52 Melodies, 5 Volume Levels, LED Flash, CB-21, Suitable for Front Back Doors Entrance Ways

**Brand:** avantek
**Price:** ₨28128
**Availability:** ✅ In Stock

## Summary

> 🔔 Elevate your entry game with AVANTEK — hear the difference, feel the convenience!

## Quick Answers

- **What is this?** Wireless Doorbells, 1000 ft Range IP55 Waterproof Cordless Door Chime Kit with 2 Push Buttons, 52 Melodies, 5 Volume Levels, LED Flash, CB-21, Suitable for Front Back Doors Entrance Ways by avantek
- **How much does it cost?** ₨28128 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/683478803-wireless-doorbells-1000-ft-range-ip55-waterproof-cordless-door-chime)

## Best For

- avantek enthusiasts

## Why This Product

- Trusted avantek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart Memory Function:** Power outages won’t disrupt your settings—your favorite melody and volume are saved automatically.
- • **Weatherproof Durability:** IP55-rated transmitter resists rain, dust, and extreme temps from -4°F to 140°F—built to brave any climate.
- • **Unmatched Wireless Reach:** Stay connected up to 1000 ft away—never miss a visitor, no matter where you are in your home or office.
- • **Customizable Sound Experience:** Choose from 52 melodies and 5 volume levels (up to 115 dB) to perfectly match your vibe and space.
- • **Effortless Installation & Expansion:** No wiring needed—mount with screws or adhesive. Add extra receivers for full coverage across multiple entrances.

## Overview

The AVANTEK CB-21 Wireless Doorbell Kit offers a robust 1000 ft wireless range with IP55 waterproof and dustproof protection, ensuring reliable performance in any weather. Featuring 52 customizable melodies, 5 volume levels up to 115 dB, and a 3-year battery life, it’s designed for seamless installation and smart memory retention, making it the ultimate choice for modern homes and offices.

## Description

With superior performance and ultra-low power consumption, the AVANTEK CB-21 Wireless Doorbell stands out among rivals. It is the easiest and most convenient choice for homes, office buildings, hotels and more. Long Operating Distance The doorbell supports an extensive 1,000-ft working range (depending on the operating environment). Rest assured that you’ll never miss any important guests or urgent deliveries again with the help of this doorbell. Durable and Waterproof Transmitter The built-in 230 mAh CR2032 lithium battery has an ultra long three-year lifespan, saving you the annoyance of frequent purchases and replacements. The impressive IP55 dustproof and waterproof rating makes the transmitter tough enough to withstand various outdoor environments. And with a working temperature ranging from -4 °F to 140 °F, the transmitter can work for you in even the harshest weather conditions. Music to Your Ears A wide selection of 52 melodies allows you to easily choose one to suit your preferences - enough for a new tune every week of the year, so you will never get bored with your doorbell’s chimes again. It is easy and simple to choose your favorite melody with the use of the Next and Previous buttons. You can also set a different ring tone for each transmitter, so you will know exactly which doorbell has been rung. In addition, the built-in 40 mm stereo speaker delivers clear and well-balanced sounds. Innovative Memory Function One of the great advantages of the AVANTEK Doorbell is its memory function. Every time you turn on the device after a power outage, it remembers your last-set melody and volume level. This makes it not only extremely convenient, but also very user-friendly. Note: Metal will interfere with the signal and shorten the transmission range. Please place the transmitter in areas away from metals.

## Features

- 【HIGH PERFORMANCE 】Our AVANTEK doorbell is approved by CE, FCC and RoHS. High performance transmitter with ultra-low power consumption, uses a CR2032 lithium battery that boasts 3-year maximum lifespan
- 【TAILOR YOUR TRANSMITTER】29 mm stereo speaker delivers rich and crisp sound; 52 melodies and 5 adjustable volume levels with a maximum setting of 115 dB; set a different ring tone for each transmitter so that you know exactly which doorbell has been rung
- 【300 M/1,000 FT ULTRA LONG WIRELESS RANGE】Will not interfere with other equipment in your home or those of your neighbours; ensures you will never miss a visitor, even if you are a few rooms away or on another floor
- 【HIGH PERFORMANCE】The transmitter has ultra-low power consumption; uses CR2032 lithium battery that boasts 3-year maximum lifespan; IP55 dustproof and waterproof rating; works between -4 °F to 140 °F; withstands various harsh weather conditions
- 【EASY TO SET UP】2 transmitters included; can add more AVANTEK Mini receivers for increased coverage; simply fix the transmitter on the wall without any wiring; includes 4 screws, 4 anchors, 1 key and 2 double-sided adhesive pads

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | AVANTEK |
| Part number | CB-21 |
| Item Weight | 190 g |
| Package Dimensions | 13.2 x 9.4 x 6 cm; 190 g |
| Batteries | 2 CR2 batteries required. (included) |
| Item model number | CB-21 |
| Size | 1 Receiver + 2 Buttons |
| Color | Mini (Black) |
| Material | ABS |
| Power source type | AC & Battery |
| Voltage | 3 Volts |
| Installation Method | Self-Adhesive or Screw-In |
| Noise Level | 115 Decibels |
| Speed Rating | 1000 Feet Operating Range, IP55 Waterproof |
| Specification met | CE, FCC and RoHS |
| 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.) |
| Included components | 2 × Transmitters (CR2032 batteries included), 1 × Plug-in receiver, 2 × Adhesive tapes, 1 × Screwdriver, 4 × Screws, 4 × Anchors, 1 × User manual |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Lithium Ion |
| tech_spec_battery_description_toys | battery_type_cr2 |
| Battery life | 3 	years |

## Images

![Wireless Doorbells, 1000 ft Range IP55 Waterproof Cordless Door Chime Kit with 2 Push Buttons, 52 Melodies, 5 Volume Levels, LED Flash, CB-21, Suitable for Front Back Doors Entrance Ways - Image 1](https://m.media-amazon.com/images/I/61Y8KQ7gPfL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Frequently Bought Together

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-01-24*