Short Description: Type: EMS Foot Massager Origin: China Model: MA-860 Color Black Material: PU Leather+ABS Voltage: 3.7V Modes: 8 Gears: 19 Frequency: 1-100HZ Working Hours: 15 Minutes approx Output: 130mA MAx Size:32.5*15*3.5cmm approx Battery Capacity: 150mAH Product Description: ABOUT EMS TECHNOLOGY: Electromyographic stimulation (EMS), also known as neuromuscular electrical stimulation, is the use of electrical pulses to induce multiple muscle contractions; The central nervous system contracts muscles. EMS has proven to be an active muscle-strengthening tool.