Tens-5000 Professional 5 mode Physical Therapy TENS Unit is one of the most powerful and advanced TENS units ever. This device features a patient compliance meter, electrode non-shock meter, cap & slide covers which protect from accidental changes as well as five modes of TENS operation.TENS stands for transcutaneous electro-neural stimulation that works by blocking pain signals when the TENS device produces gentle electronic currents which are transmitted to the skin near the area of complaints with high quality self sticking electrodes. Pain management specialist including chiropractic physicians and physical therapist alike have voted the TENS-5000 to be one of the most effective and cost efficient devices on the market today. Old fashion durability and quality are at the heart of this very modern and technical analog-digital hybrid device. Whether chronic or acute pain relief is the goal the TENS-5000 can get the job done.TENS devices have no known side effects and have been used for years by professionals and patients alike to help reduce and control pain sensation. The five mode operation is one of the most comprehensive and advanced array including conventional, burst, modulation, SD1 for pulse width modulation and SD2 for pulse rate modulation. A convenient 30 or 60 minute timer also allows for continuous use when prolonged TENS stimulation is desired. This device is also very efficient and operates from a single 9V battery for hours and hours.