EV-603M is a TENS unit with a larger controlling panel and a wide variety of output combinations. It has 4 modes available: B(Burst), N(Normal), M1(Pulse Duration Modulation) and M2(Pulse Rate Modulation). Pulse Rate, pulse duration and intensity are adjustable. The intensity controls are protected by a cap. Metal belt clip is strong and durable. A timer of 15, 30, 60 minutes and Continue is available.