We can help you O exercise muscles in all directions O practice eight-pack ABS O shape the mermaid line O strengthen abdominal muscles O high efficiency fat reduction O local shaping of molding strip O Rechargeable, easy to use EMS: Traditional exercise transmits micro-signals to muscle contraction through the brain. EMS simulates biological micro-current stimulation, drives muscles and moves by yourself. When the muscles receive signals and start automatic contraction exercise, you can sit, stand and even lie down. Specifications: Product belt: intelligent fitness instrument Battery type: li-polymer Technical physics: EMS muscle electrical stimulation Main engine weight: 14g Colors: blue, orange Battery capacity: 300mAh Package Included: 1* belt sticker +2* arm sticker +3* controller +1* data cable