Used "speed sensor" and "cadence sensor" from the standard accessories of the "GARMIN Edge 520J Set". The cadence sensor, which directly touches the crank, has a slight scratch on the back, but the condition is good, including the speed sensor. The speed sensor cover was regularly protected with "Kure Rubber Protectant", so I think there is little deterioration. For the listing, I have replaced the batteries with new ones and reconfirmed the operation, so you can use it with confidence.