Liftmaster Opener/Operator Charts

Model Number Logic Chart

Garage Door Operators

1st Digit = Generation 2nd Digit = Generation 3rd Digit = Generation 4th Digit = Drive 5th Digit = Options
8 = Security+ 2.0 /MyQ 5 = Elite 0 = Direct W = DC W = WIFI
6 = Security+ 2.0 3 = Premium 4 = Screw 5 = AC 1/2 HP
1 = Contractor 5 = Belt 7 = AC 3/4 HP
0 = Contractor/Square 6 = Chain
7 = 2 Speed Sprocket Chain
8 = I Beam Chain 2 Speed Sprocket Chain

Model Number Logic Chart

Accessories 

Example:
8550 = 8 (Security+ 2.0/MyQ) + 5 (Elite) + 5 (Belt Drive) + 0 (DC Motor)
1st Digit = Generation 2nd Digit = Series 3rd Digit = Model Specific 4th Digit = Suffix
8 = Security+ 2.0 /MyQ 9 = Remote Control 1 = 1 Button LM = Security+ & Security+ 2.0
8 = Control Panel 2 = 1 Button MAX = Compatible to 1993
7 = Wireless Key Entry 3 = 3 Button LT = Learning
6/5 = Reveiver 4 = 4 Button
2 = My Q
1 = Commercial
Example:
893MAX = 8 (Security+ 2.0/MyQ) + 9 (Remote Control) + 3 (#  Buttons) + MAX (Compatible to 1993)

Accessory Compatibility Chart