Here is the way of copy: Step1-Clear the history code from duplicator 1. Press button A and B continuously until LED flash 3 times 2.Release button B (Keep pressing button A),and press button B Slowly for 3 times,LED flash 3.Release button "A"finish code clearance. Step 2-Copy code from original transmitter 1.Put duplicator aside of original transmitter,as close as possible. 2.Press and hold button A of original transmitter,then press and hold button A of duplicator until you see the duplicator's LED flash 3.Release both buttons, finish code copy,copy other button in same way. Button A= lock button Button B=unlock button Specification: Condition: 100% Brand New Shell Material: Plastic Power: 10W Frequency: 433.92MHZ Accuracy: ±0.2MHz Remote Distance: 100 meters(Open air) Working voltage: 12V 27A Working current: ≤12mA Size: 5.3cm / 2.1inch (appr.) Package List: 1 x Garage Door Remote Control Notice: The actual distance may be influenced by different working environment. [High-quality material] The shell is made of high-quality, sturdy and durable plastic, giving you a good feel. [Stable and efficient] It can control long-distance transmission with stable performance. [Easy to carry] It has a key ring and clip, which is convenient to carry and can effectively avoid loss. [Wide application] It can be widely used in car doors, garage doors, win-dows, car alarm products, etc. [Compatible remote control] V2 PHOENIX 2, V2 PHOENIX 4, V2 PHOX 2, V2 PHOX 4, V2 TXC, V2 TRC, V2TSC4, V2 HAND.