This splitter is designed for a laptop where the socket for the Keyboard and Mouse is combined into a single PS/2 type connector (often printed green and purple on the socket). With the increasing popularity of USB connections for keyboard and mouse peripherals, many newer computer motherboards use this type of connection to save space an cost. Some motherboard makers allow both a PS/2 keyboard and a PS/2 Mouse to be used at the same time, hence the use of this type of adapter, but often motheboard manufacturers only allow one of either device to be used; the other having to be plugged into a USB port. In this latter case this adapter is unnecassry. Should a PS/2 splitter be required, however, this adapter is an excellent choice. It is well made and the tails are the right length to avoid undue stress on the socket. At the price it is excellent value for money.