Rev Counter Board: Calculate the opening distance of the opener and solve the problem that your door cannot be opened correctly,Consists of a tachometer and a limit switch to prevent your gate arm from running off | Determine the location of the fault: If the main arm fails, you will hear 3 beeps, if the secondary arm fails, you will hear 4 beeps, you need to pay attention to check the circuit board now and replace it in time | Replacement for FM350 FM352 FM500 FM502 FM600 2000XL MM500/502 Series Replacement for Mighty Mule GTO | Save money: it is very difficult to find professional repair personnel engaged in these devices, now you can DIY to solve the main arm failure problem, which is very simple and saves you money | Please sealing and draining during installation,avoid short circuit of the circuit board caused by water ingress and failure to work properly. | mounting type: Door Mount

Rev Counter Board: Calculate the opening distance of the opener and solve the problem that your door cannot be opened correctly,Consists of a tachometer and a limit switch to prevent your gate arm from running off | Determine the location of the fault: If the main arm fails, you will hear 3 beeps, if the secondary arm fails, you will hear 4 beeps, you need to pay attention to check the circuit board now and replace it in time | Replacement for FM350 FM352 FM500 FM502 FM600 2000XL MM500/502 Series Replacement for Mighty Mule GTO | Save money: it is very difficult to find professional repair personnel engaged in these devices, now you can DIY to solve the main arm failure problem, which is very simple and saves you money | Please sealing and draining during installation,avoid short circuit of the circuit board caused by water ingress and failure to work properly. | mounting type: Door Mount