My purchase, order #4552, of the SantaMedical Mini Pulse Electronic Stimulator has really exceeded my expectations in providing pain relief for tight muscles in my shoulder from an injury. All of the modes are extremely stimulating and are able to target the specific area requiring attention. The intensity time options are excellent for providing the stimulation that is necessary for relieving the tightness in my shoulder. It is amazing that such intensive stimulation can be provided in such a compact device. I would highly recommend the Mini Pulse Electronic Stimulator to anyone who having tightness and pain in the shoulder area.