Microprocessor Based 4 Channel Auto Mode TENS is a medical device used for pain relief therapy. Through electrodes positioned on the skin, it is intended to deliver carefully controlled electrical impulses to the body's nerves. The device has a microprocessor, which enables accurate control of the electrical impulses and the creation of customized treatment regimens. Microprocessor Based 4 Channel Auto Mode TENS is safe to use. When the device is in auto mode, it can automatically change the electrical impulses' frequency, intensity, and duration to meet the needs of the patient.