What common device uses electrical stimulation for pain management?

The TENS (Transcutaneous Electrical Nerve Stimulation) unit is a device specifically designed for pain management through electrical stimulation. It works by delivering low-voltage electrical currents to the skin via electrodes placed on the body. This stimulation can help reduce the perception of pain, likely through the activation of the body's natural pain relief mechanisms and the modulation of pain signals traveling to the brain.

In contrast, a pacemaker is used to regulate the heart's rhythm, while a transformer is a device that changes the voltage of electric power, and an oscilloscope is used to visualize electrical signals. None of these devices are primarily focused on pain management through electrical stimulation like the TENS unit is.