PTX4 -4 Securacode Gate Garage Door Remote Control Replacement 433.92MHz Rolling Code for CRX-1 CRX-21. Type: Programming with the receiver 2. Frequency: 433.92MHz 3. Code: Rolling Code 4. Buttons: 4 When your remote control is lost, you can buy our remote control and pair it with your receiver, after the remote control is programmed successfully, you get a new remote control. For PTX4 -4 Securacode Gate Garage Door Remote Control Replacement 433.92MHz Rolling Code For CRX-1 CRX-2 Note: If your old remote control is not an PTX4, please do not buy it. Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic Package Contents: 1 * Garage Door Opener Remote Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.