Dongle for Wyze Lock (Keychain Remote)

I would love a dongle for my keychain that I can push to unlock my door. I can never get auto-unlock to work.

/ **Mod Edited- Keychain Remote added to title for extra clarity

I would only buy this if it had a user replaceable battery or if it was extremely cheap as I would assume the lifecycle of the battery would be similar to something like a tile tag for finding your keys.