Main unit features five buttons and four display panels Buttons: Mode select Time up Time down Start or stop On or off Panels: Mode Pressure level Electricity level Timer Operating procedures: Insert power cord and array into corresponding jacks in chassis Place array into basin filled with water, then turn power on, and press on/off button Time and work pressure will show accumulative treatment time used Work pressure indicates number of hours Time indicates number of minutes used Total amount of time used is up to 60 minutes There will be an increase in one hour shown in work pressure panel OEM orders are accepted