Converts standard 5.5mm x 2.1mm Round DC Connector to 5.5mm x 2.5mm adapter connector with Grewy Unsprung tip type endSTOCK CODE - CTSimply plug ontothe power tip of any power supply with 2.1mm DC Connector and convert it to a 5.5mm x 2.5mm Male DC Connector - but please remember this will not convert voltage - so the power supply must be of suitable rating for your Laptop etc - this item will only convert the size of the tip.This item has FEMALE end that accepts 5.5mm x 2.1mm Male DC Connector and converts it to 5.5mm x 2.5mm x 9mm DC Connector with grey unsprung tip type end - note this is not the longer 14mm shank usually used in laptops/netbooks etc but is the standard length used to power a lot of DC devices. YOU MUST make sure power supply is correct voltage foryour device. This adapter DOES NOT come with anypower supply - It is an adapter tip ONLY. MPN P2GADPL21.55.55.25G Brand P2G Type Connector Adapter Unit Type Unit