Works on these Treadmill Models: 

Alliance
A4T
A7T
ALL815
ALL835HR
ALL855
EC8500
EC850OB

Discovery
dcv100
DCV3.0
dcv300
dcv415
DCV560HR
DCVA1
DCVA1T

Encore
EC1500
EC1500C
EC2500
EC3500HRC
EC4500
EC6500
EC920

HealthTrainer
700 (HT701)
HT2.0
HT801
HT901HR
HT901HRC

Ironman
M2
M5

Keys Fitness
4000
800
8800LI
9000OB
A8T
EC815
GT2110
GT5510
MS1200GT
MS2200
MS3200HR
MS4200
Pinnacle Z40
Pro 1000
Pro 2000
Pro 550
Pro 650
Pro 900
Pro 950
Pro 980HRS
Pro 980S
Pro-850

Smooth Fitness(1984 - 2014)
SM5.0P, SM5.2P, SM5.1HRC
SM5.0PV2
SM5.0PV2A
SM5.3P
SM9.3P