Mini APM V3.1 Flight Controller For ArduPilot Mega External Compass APM Features: 100% Brand new and high quality! Use APM firmware and ground station, no need to modify No onboard compass, which makes this version ideal for use with multicopters and rovers 8-CH output and 8-CH input Can connect to external GPS, compass, telemetry system and PM module 12-CH function interface Specifications: Factory number: MINIAPM The hardware version: V3.1 The GPS module: does not contain Support mode: fixed wing helicopter rotor Color: Black Dimensions:1.49 in x 1.49 in x 0.43 in (3.8 cm x 3.8 cm x 1.1 cm) Package included: 1 x MiniAPM V3.1 flight controller 1 x Cables and pins 1 x Plastic Case