The Meike MK-A9 PRO controller is compatible with Sony A7 III, Sony A7R III, and Sony A9 cameras. It provides additional power to the camera with 1 or 2 NP-FZ100 batteries. The wireless remote control operates with 2 AAA batteries, which are not included in the package. The remote control also features a timer function. The controller includes a vertical shutter button as well as other multifunction switches. It supports 2.4G wireless transmission, which works up to 100 meters. Thanks to the 1/4" screw mount, it can be attached to a tripod. Weight: 420g.