The RM-CB2 cable release allows you to focus and trigger the OM-D E-M1 Mark II without the vibration associated with the use of the shutter release button. This is especially helpful when macro photography or microshooting, where the camera is absolutely still. The RM-CB2 connects with a 2.5mm stereo mini plug, so the USB port can be left free for tethered shooting or connecting a PCM audio recorder like Olympus LS-100. Pin Jack (2.5mm Stereo Mini Plug) Release Cable (Barb Photography Lock Type)