Its prime use is the neck and shoulders, although there are instructions for lower back and feet. I love using it on my neck and shoulders with the heat. The heat is warm, but not hot, which is nice and relaxing. The pressure and rotation of the massager feels like a person giving the massage- it's wonderful! Some similar massagers chop/pound/vibrate; this one actually kneads. After a long day on the computer at work, and then the long drive home in rush hour traffic, this is the perfect way to wind down and relax.
While it is completely portable, and the box that it comes in has a handle and is pretty sturdy, it is a little on the heavy side (but most of these kind of massagers are!).
You can get yours here - http://amzn.to/2aiCAVt
I received this product complementary in exchange for my honest review; all opinions are my own.