... Model No.: DL-4021CDescription:Auto-copy 2262/2240/2260 RF Remote control duplicator How wonderful if we don't need to worry ... learning in secondsApplication:car alarms, home alarms, panic buttons, garage door, rolling curtain, etc Frequency:280-490Mhz Learning code: Fixed ... flash and extinguish immediately, at this time, keep pressing the lock button, and release the unlock button, continue to press ...