MSRD exterior. Circuitry is contained in plastic boxes attached to the belt. MSRD interior. Eight electrodes (four positive, four negative) are pressed against the lower back and the ninth (ground) goes near the hip bone. Vibration motors are contained in fabric pockets between the electrodes. User wearing the MSRD. The final device is compact, adjustable for a large range of waist sizes, and only 3.6 lbs.
