« on: October 21, 2014, 10:22:59 am »
In the past many wireless devices, including cyclometers and heart rate monitors, had serious problems with interference from outside sources of RF like power stations, overhead high voltage wires, radio transmitters, etc.. Sometimes they would even read the signal from a similar cyclometer or HRM on the bike next to them.
Newer, better models have coded transmitters/receivers that do a pretty good job of ignoring these outside sources so the problems have been minimized. Despite that, wired models have no issues with any outside signal and have only one battery to worry about and can be less expensive. As noted, some models (Cat Eye Enduro for one) have heavy gauge, strong wiring harnesses so they are well protected from damage.