This is a kind of EMS foot massager, adopt EMS tech, which is the elictation of muscle contraction using electric impulses. The impulses mimic the action potential coming from the central nervous system, causing the muscles to contract. EMS is proven to be quite effective as a proactive tool for muscle strengthening. The soft PU pad is comfortable and neatly fits the contours of your skin, and can distribute the pulses effective. You can massage your feet muscles anytime and anywhere you want, such as working, watching movies or doing housework. Try it.