Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. Accurate and versatile biofeedback for muscle re-education * Two models of feedback * 13 segment LED bar graph visual feedback * Wide and narrow filters provide precise monitoring of normal and fatiguing muscles and eliminate EKG artifact * Highly sensitive active sensor needs minimal skin preperation to locate muscle sites quickly * DC voltage output connects accessories and permits volt meter monitoring * Weight: 2.5 lbs* Dimensions: 1" x 2.4"x 4.4"