The NatraCure Peanut Roller Massager charges with the included power adapter (no USB cable) and is almost fully charged in the box. It has indicators, a charging port, and a power/mode switch on one end of the "peanut". For some weird reason, they designed this thing with a motor, controls, and lights on one end and nothing on the other end of the sphere. So the other end only has ambient or passive vibrations and doesn't work very well for tissue massage like the other end. So I think this will work for the "grip" because grabbing the peanut under the thigh or calf doesn't work evenly, the massage will go to the end of the switch. Another strange feature is modes. The first mode is a very weak shake, the second is a little more intense. Then *three*? It "rolls" in a cycle from level 1 to a full level 4. And level 4 of course top speed/vibration. If I were an engineer I would do 1, 2 and 3 equal intensity steps from lowest to highest and do 4 toss from low to high over and over again. But that's just my humble opinion. I recently tried another massager similar to this one for the price, it was a hard ball and it was a 3 stage massager with much more intensity. So I can't give this place more than 3 stars.
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