This is a Treadmill Doctor Replacement LifeSpan Speed Sensor Part Number 405503470210001 Used on the Following Models Listed Below.

LifeSpan - 
C3i - (AK**A) 
C3i - (AK**B) 
LS-5T - (X**A) 
R3i - (AJ**B) 
TEKK1 - (A****A) 
TEKK2 - (B****A)
TR100 - (AG**A) 
TR100 - (AG**B) 
TR1000-08 - (E**G) 
TR1000B - (10B) 
TR1200B - (AR**B) 
TR1200B - (AR**C)
TR1200B - (AR**D,12B) 
TR1200DT - (AR**A) 
TR1200i - (AB**A) 
TR1200i - (AB**B) 
TR1200i - (AB**C) 
TR1200i - (AB**D,AB13D) 
TR1200i - (AB**E) 
TR1200i - (BP**A) 
TR1200iT - (DH**B) 
TR1200iT - (DP**A,DP**B) 
TR1200iT - (T12) 
TR200 - (AA**A,AA**C,AA14H) 
TR2000-HRC - (F****A) 
TR2000e - (CD**A) 
TR2000e - (CD**B,T2E) 
TR2000HRC-08 - (F**B) 
TR2000i - (DQ**A,T2K) 
TR2000iT - (DQ**A,T2K) 
TR200i - (AA**B) 
TR2250-HR 
TR3000-HRC (2007) 
TR3000-HRC - (G***A) 
TR3000-HRC-08 - (G**B) 
TR3000e - (CE**A) 
TR3000e - (CE**B) 
TR3000i - (AC**A) 
TR3000i - (AC**B) 
TR3000i - (AC**C) 
TR3000i - (AC**D) 
TR3000i - (BT**A) 
TR3000iT - (AC**E,T3K) 
TR4000i - (AD**A) 
TR4000i - (AD**B) 
TR4000i - (AD**C) 
TR4000i - (AD**D) 
TR4000i - (AD**E) 
TR4000iT - (DN**A,DN**B,T4K) 
TR500-08 - (D**A) 
TR5000B - (AZ**A) 
TR5000B - (AZ**B) 
TR5000B - (AZ**C,5KB) 
TR5000B - (BJ**A) 
TR5500i - (CT**A) 
TR5500iM - (T5M) 
TR5500iT - (CT**B) 
TR5500iT - (CT**C,T55) 
TR800 - (AE**A) 
TR800B - (BM**A) 
TR800B-2017 - (DG**A,80B) 
TR800DT - (AT**A)