I have had one of those once before. Its very small. You cant take a shower or bath with it on but you can remove it to do these things. zthey come with enough electrodes to get you through the month. When you have a symptom you press record. I think it will hold up to 5 events before you have to call it in. Of course you keep a little diary of what symptoms you had and what you were doing. When you call the events in dont get freaked out if they ask you to do another recording. It happened to me. The recording stopped on a pvc and they had me do another to make sure it wasnt anything seerious.