The waveform refers to the stimulation pattern provided by the TENS device. The Aleve Direct Therapy patented 3-stage waveform stimulation pattern can help relieve pain by helping block pain signals and may also stimulate the nerves to produce endorphins, which reduces sensitivity to pain. Sometimes people grow accustomed to the selected treatment intensity during treatment, so it feels less intense. The Aleve Direct Therapy waveform stimulation pattern can help minimize this from happening, but it is still possible. You can adjust intensity with the remote control "+" or "-" buttons. If adjustment does not work, you may need to replace the batteries in the device.