EV-507D is a dual channel combination stimulator of TENS and EMS. It features large liquid crystal display, accurate and gentle increase of intensity. Its settings and amplitude value can be locked to avoid accidental touch. Intensity is increased by 1mA each step. A low battery sign will show up when the battery is low. The device has a timer of 1-60 minutes and continue. It is possible for you to check the balance treatment time on the LCD. There are 4 TENS modes and 2 EMS modes, which is ideal for the patients. The protection cap is an optional design for people are especially careful when doing treatment. A compliance meter allowing physical therapist to check the accumulated treatment time.