Features: Clear code: using two fingers, hold two buttons at same time (i.e., A & B or B & C, etc.); the will rapidly flash 3 times in about 2 seconds; let one of the fingers go (the other finger should stay holding one of the button), and then use the loose finger to quickly click three times on the loose button until the light flashes; then release both buttons; then any one key of the remote control. When light goes off, it means clear code is successful (four keys all empty); if after you any button of the remote control, the light is still on, it indicates that the code has not been cleared successfully. You need to re-clear, and successfully clearing the code can cloning be successful. You can repeatedly clear and clone the code. Copy: left hand taking the remote control, right hand taking our remote control duplicator and keep two remote control as close as possible; the first buttons of two remote controls at the same time; in about 2 seconds, the light will flash quickly 2 times; after one second, the indicator light keeps flashing and let go of your fingers; and then the key after successful pairing, the light keeps on, which means that the first key code on remote control has been copied to the other remote control; the same method can be used in turn on the second key, the third key... If the copy is successful, the remote control function is the same as the matching remote control. : When you accidentally clear the copy of the remote control code, you can simultaneously the copy of the remote control of the bottom two keys, lights will flash quickly, let go after pressing any key. When the light is long, this Indicates that the code for the remote control is restored. Before using our copy remote control, please be sure to the existing code from the remote control. How to deal with the situation where some of the keys can control, the rest cannot control? You can use clear and operation, the specific operation is as follows: first clear code; after clearing code, copy the unsuccessful key again, and there is no need to copy the rest buttons; and then clear the code again; code; at this time, the keys that were not successfully copied are now covered by new codes, and the keys that were successfully copied are now retained. If there is no copy after the second copy of the keys, the above steps again and again until all keys are successfully copied. Specification: Material:Metal Color:Blue/Black/Silver/Red Size:Approx.6.6x1.5/2.6x0.6inches Operating Frequency: 433 MHz Package Includes: 1x Remote Control Duplicator -functional And -variable, And User-friendly Simple Design And Fast To Use. This Smart Copy Remote Control Is Suitable For Electric Door Remote Control, Telescopic Door Remote Control, Garage Door Remote Control. Widely Used In Vehicle Central Locking Systems, Garage Doors, Electronic , Electrical Appliances, Home Automation, Lights, Car Sunroofs, Car/Motorbike , Etc. Stable Signal Can Pass Through Walls, Floors, Doors Or Windows. Small And Compact, Easy To Carry And Convenient To Use.