We recommend the Chattanooga Continuum for Task Specific Electric Stimulation with the use of a hand switch. Below are some links to help you locate them online.
Chattanooga Continuum Neuromuscular Electrical Stimulator
You may also purchase the unit separately, lead wires, and hand switch as available.
Electrodes come in various sizes. We prefer 2X2 inch squares, 2×3 and 2X4 inch rectangles, and 1.25 inch circles.
Medcor Professionals is a supplier that provides excellent customer service, if you prefer personal attention and a vendor.
My Amazon List of TASES supplies