Power supply with conventional power bank .. USB 5V DC to 15V DC Boost step-up converter Cable from USB to Hirose 4 pin Male .. powers up Sound Devices Field-mixers like 633,688 etc. backward compatible with Sound Devices 552,442,302 Test: a SD633 runs for about 6 hours non-stop using a 20000mAh power bank(recording + Phantom48v) The Powerbank and the mixer displayed in the pictures is not part of the auction" "A power bank with 10000 mAh/ 3A is recommended" Power supply with conventional power bank.. USB 5V DC to 15V DC Boost Step-up converter (Boost converter) Cable from USB to Hirose 4 pin Male.. backwards compatible with Sound Devices 302,442,552 etc. Test: with a 20000mAh power bank, an SD633 runs for about 8 hours nonstop (+rec+P48v) (The mixer and power bank shown are not p.