This machine help you to keep fit, do exercise to your body through swing your body when you step on it. We have the patent for our designs, which are unique designs in China. Currently we produce 20,000 pcs every month for eastern Asia. Working Voltage: AC220V-240V/AC100V-120V Frequency:50HZ/60HZ Rated power:300W OEM is welcome. 1x20' loads 142pcs,1x40' loads 284pcs