Great product easy to use. Results are being felt atfer 2 weeks. The use on the back is fantastic after a day at work. the battery holds 8 to 10 sessions. This is not a gym alternative but it really helps when having a busy life to accomplish a tonning while driving walking cleaning at home ... Slendertone mails are great for following but also helping to achieve our goals Really worth the investment. Having 2 user profiles would be great.