The Indipro Sony L series battery adapter plate allows you to power your camera or device that requires a Sony NP-FW50 Battery. By inserting a Sony L type battery into the locking plate, The attached Sony NP-FW50 type Dummy battery, can power-up the camera or device or for an extended period of time. There is a 1/4 20 insert for mounting on camera or rig. Also included is a 15mm rail mount. Provides an output of 7.4V. To remove Sony L battery from plate, press Locking device and slowly slide battery out of plate. The Indipro Sony L series battery adapter plate is designed to last through all aspects of production.