This white tens mini 2 channel is a safe and convenient way to relieve tension & fatigue from aching ankles calves & feet as well as improve circulation & muscle tone. With 0 to 99 minutes timer, it has reliable operation as it applies acupressure effect to the human body which relieves the nerve compression from inter vertebrae disc spaces. Further, it has 7 second on and off burst mode selection and power input of 220V/50 Hz. The high functionality and durability makes this machine a good buy.