-Transcutaneous electrical nerve stimulation (TENS) -Relieves pain without drugs or side effects -Universal cuff 2 wear-resistant contact electrodes -4 programs -Removable control element with LCD display and practical belt clip -20 adjustable intensity levels -Timer -Automatic shutdown -Battery change indicator -Ankle joint: cuff for use on the ankle joint (circumference of the ankle joint 18 - 31 cm)