SmallRig V Mount Battery Adapter Plate (Basic Version) with Extension Arm 3499 is designed to provide greater battery life to your camera rig via a V mount battery. Its standard quick-lock V mount supports most V mount batteries. Output ports, including an 8V DC port, a 12V DC port, and two 14.8V D-Tap ports, work with a V mount battery to power your camera and other equipment (e.g. monitor, transmitter, follow focus, mobile phone, etc.). It features a power switch that controls all of the output ports more quickly and conveniently and comes with a 15mm dual rod clamp with an adjustable extension arm that suits a 15mm rail support system and can quickly reposition the battery adapter plate. In addition, multiple 1/4?-20 thread holes allow attaching other accessories such as super clamp mount and magic arm. Compatibility: The plate fits most V mount batteries but PAGlink series V mount batteries and Patona Premium Battery for BP-190WS. Package Includes: 1 x V Mount Battery Adapter Plate 1 x 15mm Dual Rod Clamp with Extension Arm 2 x Allen Wrench 2 x Screw