samson s-amp

this is a used samson s-amp.mint condition,ive owned it for less then 24 hours as of this posting with about 0 minutes run time on it,the only reason i aam selling this is there is no on off switch ,it stys on constaantly unless you unpug this from the unit or wall. this is just how this item is made and i did not know this at the time of purchase. this is used,but in new condition. comes with the power supply,thank you for looking.