One "MN6221D" IC from Matsushita (now Panasonic). This is the melody IC famous for the entrance chime of FamilyMart. This is a genuine domestic product purchased directly from a semiconductor trading company, not a parts shop. It has been discontinued for quite some time, and it is an extremely rare semiconductor that is very difficult to obtain (no more stock in circulation). ● Since this is a new product stored by a specialized trading company since the manufacturer's shipment, we cannot accept any claims for malfunctions. Only if requested, we will check the operation before shipping (however, please understand that the IC will no longer be new as it will be powered during the operation check). ● A copy of the datasheet will be attached, but we will not provide technical support such as how to operate it, so please purchase only if you know how to use it. If you have any questions, please ask in the comments before purchasing, and we will answer them as much as possible. ● To play the sound, you will need a single dry cell battery, resistors, capacitors, transistors, a speaker, and a board or wires to connect them. If you also want a playback board to play the sound immediately, we will sell it separately for 32,000 yen, so please consult with us. ● This is a very old CMOS, so please be careful of static electricity when handling it (it will be shipped with it inserted in the conductive sponge in the photo). This is not a product for general consumers, so we would appreciate it if you could consult with us in the comment section before purchasing for a smooth transaction. Please refrain from price negotiations.