You're bidding on a remanufactured OEM BMW smart key with new aftermarket case installed,the circuit board is original OEM one,it has been tested and shown in good working order,the frequency is 315Mhz.Please be noted,the BMW dealers won't reprogram this remote for you,it can be only programmed by some professional locksmiths,please check with them before buying,as not all of them can do it.This remote is NOT self-programmable,it won't work,the self-programming video that you saw on youtube is only good for the brand new one you order directly from the BMW dealership.