This remote is suitable for all two single garage opener ATA GDO2 and GDO4 & Fitmadoor GDO2 GDO4.
If your motor works based on frequency (rather than dip switches), you could just order MK227 and it will work for sure.
If your motor is very old. it is possible it has dip switches on the main motor drive unit, then there are two scenarios:
1) If you do not have any existing remote that works, then you could order MK227 and we will send the instruction together with the remote. Your wall button would still work after you program the newly ordered MK227.
2) If you have existing remotes that work, please order receiver kit MK402 (one receiver and two remotes). It is very easy to install the receiver, however your existing wall button will no longer be working after you install the receiver. But MK402 comes with two remotes and you could use one as your wireless wall button. The reason is because if you purchase MK227 and your existing remote will no longer be working as MK227 is using frequency and your old motor is using dip switches.
Please check your main motor drive unit first before you place an order.