The DTSA73 Coiled D-Tap to Sony a7 III (Sony NP-FZ100) Type Dummy Battery Cable from IndiPRO Tools allows you to power the Sony a7 III Series cameras from any power source with a D-Tap input and 11 - 19V output. It features Built-in chip that delivers battery status to camera indicator. The dummy battery end is compatible with the Sony Alpha a9, a7 III, a7R III cameras.