The Painaway uses the well-known TENS principle (Transcutaneous Electrical Nerve Stimulation) to block pain messages from reaching the brain. According to the 'Gate' theory of pain, stimulating the large-diameter afferent nerve fibres (which mediate touch and pressure signals) with sufficient frequency and intensity 'closes the gate' to pain signals travelling along the small-diameter afferent nerve fibres.
Please note that this continuous-wave device is much more powerful than the TENS machines available over the counter or given to patients for home use.
The device is powered by a standard 9-volt 'PP3'-size battery (not supplied) - a long-life type is recommended. Alternatively, rechargeable batteries and a charger are available as optional extras. These are special batteries; 'normal' recherageble PP3s are not suitable.