※Please read the profile section before purchasing. This is a DC conversion plug. The female side is 5.5mm outer diameter / 2.1mm inner diameter, and the male side is 5.5mm outer diameter / 3.3mm inner diameter / 1.1mm center pin, and the male side conforms to the EIAJ#4 (EIAJ4/EIAJ-4) standard. EIAJ#4 is a commonly used plug, but it is often not included in DC conversion plug sets, so it is recommended for those who want to obtain it individually. Please use it with an AC adapter that has a 5.5mm outer diameter / 2.1mm inner diameter plug. Please make sure the plug fits before purchasing, as returns are not accepted if it doesn't. This is a new bulk item, but to avoid initial defects, we have checked its operation before shipping. ※Multiple units of this product are available. If you want multiple units, please comment with the desired quantity before purchasing. Discounts are available for multiple purchases. (However, the discount will only be the shipping cost for combined shipping) ●Warranty We will exchange the item for initial defects. Please contact us via the comment section within 14 days of receiving the product. (If the item is out of stock, we will cancel the order)