Interferential current therapy (IFC): The IF 4000 Interferential is an analogue interferential stimulation device that is used for symptomatic relief and management of post surgical, post turmatic acute, and chronic pain. The IFC 4000 is able to change its amplitude,wave lenght, and stimultion mode. Amplitude: 0 to 16mA each channel. :Stimulation Mode: 1. Continuous, 1/1 abrupt 2. 6/6 ramped and 6/6 abrupt. 3. 10/10 ramped and 10/10 abrupt.