This PICAXE USB download cable connects between a stereo socket attached to the picaxe and a computers USB port. A very convenient download cable as its is compatible with any software application that supports programming of PICAXE chips. The cable contains a tiny circuit board, moulded into the USB connector. This circuit contains a USB to serial convertor chip, and so the actual data transfer to the PICAXE chip is via a 5V logic level serial connection.