KEYDIY Car Remote Key Universal Type 4 Buttons B31

The KEYDIY B31 is a universal 4-button remote from KEYDIY's B Series, designed primarily for garage door applications. The B31 features a clean keyless-entry housing — no flip blade, no key cutting required.

The B31 supports both HCS (rolling code) and fixed-code garage door opener systems and can be generated through KEYDIY tools to replace a wide range of OEM garage remotes. Frequency is adjustable across approximately 300–500 MHz, covering the common frequencies used by major garage door opener manufacturers, and KEYDIY's database is updated weekly to expand compatibility as new models are released.

Programming is straightforward and is supported by all KEYDIY remote generators including the KD-X2, KD-MAX, KD900, KD900+, and KD Mini.