Tens are transcutaneous electrical nerve stimulators controlled by a micro-processor. They relieve the symptoms of muscular pain, poor circulation, peripheral numbness, fatigue, stiff shoulder, neuralgia. It is an advanced Digital Programmable TENS unit which allow to set 5 programs. Its intensity can be adjusted by 1mA each step from 1 to 80mA. It has five modes: B(Burst), N(Normal), M(Pulse Rate Modulation), SD1(Pulse Duration Modulation)and SD2(Pulse Rate Modulation). A compliance meter allows physical therapist to check the accumulated treatment time.