I have tried these items several times already. the arm bands work great, the abs item did NOT work the first time I tried it, no matter what mode I had it on. I took it off and tried it again and it did work for the most part. the main part for the abs was working, but the sides was not working. I took the charging device off and snapped it back in place. the sides still do not work and don't know if they are supposed to work. I will continue to use this device. The only major concern i have is...