A 315 or 390 MHz marking describes radio frequency, while Intellicode, CodeDodger and Security+ describe different code systems.
Why this matters
Two transmitters can use the same frequency and still fail to pair because their messages are encoded differently. The Genie universal chart illustrates this: each row names a brand technology alongside an RF hint rather than declaring all devices at that frequency compatible.
What to do next
Use frequency only after the opener’s system has been identified from its model, LEARN button or original manual. A listing that says “390 MHz” without a protocol is still unverified for your door.
An example from the universal chart
Genie’s ACSCTG chart includes both Genie Intellicode and Overhead Door CodeDodger entries with 315/390 MHz radio hints. The same numbers appear alongside different named systems because they describe the carrier, not the message language. A generic “315/390 MHz” seller listing therefore leaves out the key compatibility fact. Find the opener’s protocol and compare the candidate’s actual manufacturer chart row before buying.
Official sources and review scope
These links support the claims on this page. Check your exact model and the manufacturer's latest revision before buying or programming.
- Genie ACSCTG-UNIV2 compatibility chart store.geniecompany.com · checked 2026-11-04 · Protocol-by-protocol cross-brand list; does not list white Security+ 3.0
- Learn button identification chart support.chamberlaingroup.com · checked 2026-11-04 · Button color/shape, technology, era, antenna; white square pre-1993 differs from white round 2025+