The 521I is built onto a small clamp that suits a wide range of applications. It uses the LANC protocol adopted by Sony and Canon Mini DV, and Hi8 cameras. This device controls Power On/Standby, Record/Stop function, zoom in and out and focus in and out and the zoom wheel direction can be reversed. It is supplied with 522SCA connector coiled cord cable measuring 25cm (extendable to 50cm) long.