What is ?The principle of fitne is to transfer the current signal to your muscle directly, The human body recognizes these current signals as human bio-electricity signal. The signal can stimulate muscle contraction and achieve the purpose of reducingfat and slimming.Package includes:ControllerMaage beltUSB charging cableManualNotice:To ensure the correct and safe use of the product, please read the manual carefully before use.The precautions described in this manual are intended to ensure the safe and proper use of the product and to prevent injury or property damage to yours and others.:Package Dimensions :8.7 x 8 x 1.7 inchesBelt Size: 13*110cm (waist)/ 41cm(arm)Material : ABS+PUWorking temperatur : 10-35?Model(intensity):12(20 level)Working voltage:3.7V/mAWorking time:15 minutesBattery capacity:1mAhReminder:The host will shut down automatically when maage path have been removed for 10 seconds