Is this compatible with thd avantek db-21?

Mini doorbell receiver can only be paired with mini doorbell set.

Where can i find the specific instructions for pairing this add on receiver to the wireless doorbell, avantek d-3w?

Please the volume button and hold until the light flashes red and you are done!!

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🔔 Elevate your entryway with sound that speaks your style!

SMART MEMORY RECALL - Automatically remembers your last volume and melody settings after power outages.
CRYSTAL CLEAR ALERTS - 115 dB max volume ensures you never miss a visitor, even in noisy environments.
ENDLESS MELODY OPTIONS - Choose from 52 unique chimes to match your mood or season—goodbye boring doorbells!
SEAMLESS COMPATIBILITY - Easily pairs with multiple AVANTEK Mini doorbell models to expand your home coverage.
USER FRIENDLY CONTROLS - Intuitive next/previous buttons and 5 volume levels let you customize your alert effortlessly.

The AVANTEK CR-1 Mini Doorbell Add-On Receiver boosts your existing AVANTEK Mini doorbell system with a powerful 115 dB speaker, 52 customizable chimes, and a smart memory function that retains your settings even after power loss. Compact and lightweight, it plugs in easily to extend your doorbell’s reach and ensure you never miss a visitor, all while offering effortless control and seamless compatibility with multiple AVANTEK models.

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