The Mini APM3.1 Flight Controller with Power Module for Multicopter FPV board is a modified version of the APM2.6 board but made to be as small as possible.
Model : Mini APM3.1
Input Voltage (V) : 18~28
Firmware : APM firmware and ground station,
Sensors : GPS, Compass, and Telemetry
Micro-SD Card Slot : No
Dimensions (mm) LxWxH : 35 x 35 x 8
Weight (gm) : 19
Max current sensing : 60A.
Switching regulator outputs : 5.3V and 3A max.
Power Connector : XT60.