AVANTEK CB-21 Wireless Door Bell – 1000 ft Range, 52 Melodies, Dual Transmitters

Why the AVANTEK CB-21 Door Bell Stands Out

In a bustling home or small office, a doorbell should be reliable, flexible, and easy to use. The AVANTEK CB-21 delivers a crisp, room-filling chime with generous wireless reach and thoughtful customization. This system is designed to fit modern living spaces, from open concept main floors to multi-story layouts, offering practical features without overpromise.

Easy setup, flexible coverage

• Two transmitters are included, and you can add more AVANTEK CR-1/RB-1 receivers to extend coverage without wiring.
• Wall-mount the transmitter in minutes using the included screws, anchors, adhesive pads, and a handy removal key for updates.

Whether you’re in a single-family home or a compact condo, the CB-21 keeps visitors visible and alerts audible, without cluttering your space with cables.

Crystal-clear sound and tonal variety

• The 29 mm stereo speaker delivers rich, crisp tones that cut through common room noise.
• Choose from 52 melodies and five volume levels, with a maximum of 115 dB for larger rooms or open layouts.
• Assign different melodies to each transmitter so you instantly know which door is ringing.

Durability and dependable performance

• Ultra-low power consumption with a lithium battery that can last up to three years under typical use.
• IP55 dustproof and waterproof rating; operates across a wide temperature range from -4 °F to 140 °F for varied climates.

Memory and everyday convenience

The memory function preserves your last melody and volume level after a power outage, so the system returns to your preferred settings with minimal fuss.

In short, the CB-21 blends long-range reliability, customizable tones, and durable design to suit diverse entry points in your home. It presents practical possibilities for smoother daily routines, without promising outcomes—instead, it invites you to explore tailored doorbell options that fit your space.