Abstract: A percussive massage device includes a motor including a rotatable shaft, a piston configured to reciprocate rotation of the rotatable shaft, where velocity of the piston is a function of a rotation speed of the rotatable shaft, an amplitude adjustment system having user-selectable settings, where the amplitude adjustment system controls a distance the piston travels, and a speed control system configured to control the rotation speed of the rotatable shaft.

Abstract: A modular electronic device case includes a jacket and a shell removably coupled to the jacket. A tablet-shaped electronic device, such as a tablet computer, may be secured in the shell and may be covered by the jacket when the shell is coupled to the jacket. The shell may be removably coupled to the jacket using magnetic coupling. Thus, the tablet-shaped electronic device, when secured in the shell, may be used with or without the jacket. The jacket may also include one or more foldable lines separating the jacket into foldable panels capable of being folded to form a stand for supporting the device in different configurations. The modular case may also include one or more additional components coupled to the jacket including, without limitation, a pocket, a backup battery, and/or a keyboard.