This is an Active DI with the possibility to connect a 9v battery or 48v supply with your console.
Connectors XLR / Jack / Link with XLR inputs and output.
Phase inverter / Lift Pad GND and finally everything a DI should do!
The use is very simple when you know the DI
I have four for the studio, bought used 15 euros pc are nikel.
Compared to other more expensive brands are solid and LD Systems brand has not blush!
The sound is not transparent color, very clean, there are no particular noise.
I never had particular problems
I did not used with batteries, always with 48v
The dynamics are good, they work very well.
The quality / price is great!