The Sony NP-FW50 Fully Decoded Dummy Battery + 5V/2A Dual USB Cable from DigitalFoto allows the use of a USB power source to power devices that use a Sony NP-FW50 battery, providing continuous camera operation in applications where stopping to change batteries is not suitable. It includes a dummy battery with a 2.1mm female connector and a 2.1mm male to dual USB Type-A Y-cable to provide redundant USB power to your device.