Security+, rolling code technology No passcodes or PIN numbers to remember Capability to read up to 4 unique fingerprints Fail-safe protection; only accepts the fingerprints you program into it Programs in 4 easy steps Wireless, battery-operated (included) Weatherproof, slide-up cover Compatible with all Liftmaster 315 MHz garage door openers having a purple learn button. The system uses biometric technology that enables an authorized user to gain access by scanning their fingerprint. The sensor strip on the unit makes a numeric template of the fingerprint that is unique to that user. Can work with all brands of garage door openers with universal radio control part 365LM extra.