This INDIPRO TOOLS V-Mount Plate allows you to connect V-mount batteries to your Sony A7, A7r, or A7s. It connects to the camera via a dummy battery, which extends out from the side on a 20" cable, and an integrated regulator ensures that the correct voltage is delivered to the camera. The plate also features one P-Tap accessory ports providing 12V-17V of power (depending on your battery). This plate is attached to a 15 mm mounting clamp for easy mounting on any 15mm rod systems.