Picture is of old model. Board now contains an onboard 3A switching regulator and a header for RTC.
This is a Pihat for the Raspberry Pi that gives you two fused pixel outputs as well as two fused power injection ports. Each output can support around 600 pixels at 40fps and around twice that down to 20fps. The Pihat will power the Rpi and should not be powered itself from some other source. This Pihat is sized the same as a Raspberry Pi Zero. Recommend using standoffs to keep the board stable on top of the Pi.