Featuring a compact design the Indra Battery Pack from Phottix will provide users a way to power the Indra 500 TTL light while on-the-go. This pack features dual power ports for working with two lights simultaneously and it has an LED display that provides feedback on the power remaining. Also, the required Li-ion cells, which are not included, can be replaced easily by the user. The pack features a USB charging port for working with your mobile devices, such as a smartphone or tablet, and it works with optional cables for powering up to two on-camera flashes or speedlights.