Fangrui Product Details 1) Select The Correct Brand For Remote To Be Programmed By Moving Dip Switches Up Or Down. For Example 433,92mhz Marantec Remote Controls, Just Move Dip-switch 7 Up. 2) Press The Learn Button. The Will Led Turn On. 3) Press The Button On The Remote, The Led Flashes 4 Times. It Means That Remote Control Was Programmed Successfully. 4) Repeat Step 2 For Another Button. 5)the 2-nd Channel Programming Procedure Is The Same. Erase All Data From The Memory Card: Press And Hold Either Learn Button. The Led Will Start Flash. Keep This Button Pressed, Until The Led Will Turn Off. All Saved Data In The Memory Card Will Be Erased Permanently And Can Not Be Recovered Color: White Material: Abs 1)name: Universal Receiver Smg-662. 2)operating Voltage: 9v-30v 3)channel: 2. 4)frequency: 433-900mhz. 5) Distance: 30-50 Meters. 6) Very Mini Size: 5.5cm X 4.5cm X 1.0cm. 7) One Receiver Can Work With 400 Codes. 8) It Dont Interference Other Remotes And Receivers. 9) Brand Selector: With 8 Dip Switches User Can Make Differen