The Sescom DSLR-550D-HOCF A/V Out Headphone Monitoring Cable (1') is designed specially for Canon T2i (550D) and 60D DSLR users who employ Magic Lantern firmware in their digital video workflow. The Monitoring Cable is a solution that eliminates the need for multiple adapters, by allowing the user to employ the USB A/V port for headphone monitoring while editing video. Just plug the cable into the mini USB port of your camera or computer and attach your headphone jack into the 3.5mm TRS female connection.