CHAMBERLAIN’ POWER DRIVE] Whippets ute © Model 940D-01 Security+ Wireless Key less Entry FEATURES For use with any 315MHz SECURITY" garage door opener having a purple “learn” bunion. Personalized Password: Up to 10,000 possible combinations. Password can be easily changed if desired. Temporary Password: Can be added for visitors or service persons. This temporary password can be limited to a programmable number of hours or a programmable number of entries.