Whether it's arthritis or aching shoulders, the Perfect Tens device relieves pain with the touch of a button. It has 2 small powerful channels as well as 8 preset and one manual pain relief program, each with its own combination of settings to reduce pain in different ways. The Perfect Tens' small size allows you to take it anywhere. The included electrodes are stuck to the skin and emit small electrical pulses to stimulate the nerves in the affected area. Pain relief comes from the fact that Perfect Tens prevents pain signals from reaching the brain. It also stimulates the body's own endorphin production. If an electrode is not properly placed on the skin, the strength of the impulses is automatically reset to zero.