Sony VG-C3EM Vertical Grip and the S designation refers

and the S designation refers to the buffer design and that it can read the information off the sensor much faster than a non-S designated sensor

and a micro-USB charging cable

A built-in lithium-ion battery affords up to five hours of rich sound and recharges via USB

making repairs more convenient

and an attenuator that makes it easy to set optimum signal levels all add to this microphone's versatility

Sony VG-C3EM Vertical Grip and the S designation refersSony VG C3EM Overview Key Features For Alpha a9, a7 III & a7R III Cameras Holds Two NP FZ100 Batteries Extended Grip for Vertical Shooting Second Shutter Button and Multi Selector USB Charging via Camera Body Weather Sealed Magnesium Alloy Design Dedicated to the Sony Alpha a9 mirrorless camera, the VG C3EM Vertical Grip offers both extended battery and a more comfortable grip when shooting in the vertical orientation. The grip accepts two NP FZ100