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You'll find this info on the white sticker inside the battery compartment. Look for V1-V5, none = V1 (older), newest = CL3 or CL4.  This website features a full list of programming codes for the GE Universal Remote. Click the button that corresponds with the version number you found inside the battery compartment. For example, if you want to find the code for an Xbox, select Game from the menu. Some devices have multiple codes. In some cases, you may need to try one or more codes until you find a code compatible for your device. Once selected, you will see one or more codes for that device. For example, if you plan to use the remote for your DVD player, power that device on now. The light is usually at the top of the remote or on the power button. Release your finger once the red light is visible. For example, if programming the remote for use with your DVD player, press and release the DVD button. The red light will blink and then stay solid. If there's no button for the device specifically for the device want to program, choose any other device button. The name of the button is just for ease of use. If you see multiple device codes for your device, enter the one at the top of the list. The red light will turn off once the code is entered. If the device turns off, the code is correct, and you can now use the remote to control that device.  If the device doesn't power off, try the next code on the list. If none of the codes work for your device, try using the "Searching for a Code Automatically" method.
Open the battery compartment of your GE universal remote and remove the batteries. Locate the version number of your remote. Re-insert the batteries and replace the battery cover. Go to https://byjasco.com/support/ge-universal-remote-codes in a web browser. Scroll down and click CL3, CL4, or CL5. Select a device category from the "Device Category" drop-down menu. Select the brand from the "Brand Name" menu. Turn on the device you want to program. Press and hold down the Setup button until the red light comes on. Press the button for the device you want to program. Enter the device code. Aim the remote at the device you’re programming and press Power. Program more devices if needed.