I've been using the CC2 a lot also. I use that one overnight since it does not beep. I use the MY while I work out. I'm feeling great. The CC2 with handhelds is bargain at $159. 29 frequencies and that little zapper is solid and easy as anything to use. Easy to change one battery also. I use the rechargeable 9.6 volt paintball gun battery in it. It will put out 10 volts no problem. Best I felt in a few years and I started doing 3 hours of cardio again per day.