AVANTEK CB-21 Wireless Doorbell — 1,000 ft Range, 52 Melodies, 2 Remotes, LED Flash

Meet the AVANTEK CB-21 Wireless Doorbell, a versatile system built to keep you connected without tangled wires. Its thoughtful design blends reliable performance with flexible notification options, so you can tailor sound and visibility to your home or small business needs. The result is a doorbell that communicates clearly when someone arrives, while remaining easy to install and manage day to day.

Why people choose the CB-21

• Long-range wireless coverage up to 1,000 feet (300 meters) helps you hear visitors from across open layouts, multiple rooms, or a different floor.
• Two transmitters can be paired with distinct tones, letting you identify which door or entry point was triggered at a glance.
• A 1.1 inch stereo speaker delivers rich, crisp sound, while 52 melodies offer a broad palette of signaling options to suit your space.
• Five adjustable volume levels, up to a high 115 dB, let you choose the right loudness for your environment without distortion.
• LED visual alerts provide an additional notification cue for quiet rooms or noisy environments.

• Rugged and weather-ready: IP55 dustproof and waterproof rating keeps the transmitter resilient in various conditions.
• Weather any climate from -4 °F to 140 °F, making it suitable for indoor and outdoor installation.
• Ultra-low power consumption with a lithium battery rated for years of use, reducing maintenance.
• Memory function recalls your last melody and volume after a power outage, streamlining daily use.

Easy setup and flexible use

Two transmitters are included with the CB-21, and you can add more AVANTEK receivers for expanded coverage. Installation is quick and wire-free: mount the transmitter on a wall with the included screws, anchors, or double-sided pads. The compact design supports discreet placement while delivering dependable alerts across your space.

In everyday life, you’ll notice practical benefits like knowing exactly which doorbell is ringing, enjoying clearly audible chimes, and seeing a visual cue when you’re away from the door. While results will vary by environment, the CB-21 is designed to be a flexible companion for households, offices, or small shops that value clear, customizable alerts without requiring complicated setup.