This is a V-Lock radio receiver holder, or caddy, designed to hold Zaxcom radio receivers like QRX200 (or other Zaxcom 32mm x 83mm x 133mm units)  on the back of any camera with a V-Lock battery plate.  

This fits the Zaxcom RX900, QRX100, QRX200, QRX235. These are the fatter, narrower size Zaxcoms.  Units like the RX200 won't fit this Caddy, the Caddy Zax Thin.  

The V-Lock sandwiches between battery and camera on any 12V (nominally) V-Lock plate.

Power is delivered to the receiver via internal locking cable, this switches on and off automatically as the camera does to avoid needlessly draining batteries.  There are additional power outputs on the right hand side away from the camera operator's head providing D-Tap and Hirose power connectors, the Hirose connectors are automatically switched along with the receiver.  

Hawk Woods 'Real Power' 24V (or 26V) batteries look like they might fit on a normal V-Lock but I assure you they won't.

This is not a Zaxcom product, it is an Avington product designed to fit Zaxcom receivers.  

The Caddy has and auto on feature, and so also an auto off feature.  If you put your RX into the Caddy and attach a battery the auto off function will be activated because the camera is not on.  If you then attach a camera, or any other load, to the other side of the V-Lock and turn that on, the RX will come on.  

All prices are excluding VAT.