The GD-R21 wireless keypad is compatible with garage door openers that have the 4500DID model number. You can identify this model by the PURPLE learn button on the powerhead, which is the motor unit that hangs from the ceiling in the garage. If you have this model, you can use the GD-R21 wireless keypad to replace your old one.
Order includes a compatible remote, visor clip, installed battery and programming instructions.