Heart rate belts don’t last forever. After a certain amount of use the belt will lose its conductivity and cause loss of contact. This is the right time to change the belt.
Sizes and compatible chest circumferences:
S: 56 - 82 cm = 22 - 32”
M: 70 - 110 cm = 28 - 43”
L: 96 - 160 cm = 38 - 63”
Note! This product does not contain the transmitter, this is just the belt.