We use the E600 at our middle school. We have 2 class sets and one set is about 7 or so years old. Those are the ones we are having difficulty with since they are so old. We send the watches for battery replacement and we have changed the transmitters (had to buy new ones) as we were told that those batteries die also especially if they are wet. If you put the transmitters away and they are still wet the battery in them is still on and will not turn off until it is dry. Some of the watches record too high of a heart rate and some record occasionally and is very frustrating to the kids that they do not work properly. However, the majority work o.k. We clean them with a disinfecting solution and wipe with baby wipes (half solution and half water; this is what the custodians use). We use to only clean with baby wipes (no scent no alcohol cuz it damages battery) but since the swine flu we had to be more alert. Hopes this helps!!

We use the E600 series at my school. We use zep tackle mixed with water in a spray bottle to disinfect our transmitters but we have been told to not to put them away soaking wet because the water is hard on the batteries. We have also used a disinfectant that the band uses on their mouthpieces that dries quickly and works well. (Sorry, I can't think of the name right now.)

We use Lysol wipes the clean the heart straps. We use polar monitors that interact with our spin bikes.