Lady Pregnancy Tens Machine Dual ChannelThe Lady TENS is so simple to use. Everything is pre set except for the intensity, which is controlled by just one dial. The pre set burst mode is used between contractions. The light indicator will flash on and off in this mode. At the onset of a contraction, simply press the booster button at the top of the unit for that extra surge of power needed to combat the pain. Dual Channel 4 large pads Integrated booster button for contractions Easy to use