APM Flight Controller For Multi-rotor/ Fixed-wing ARDUPILOT MEGA2.6 APM 2.6 - Side Pin>>Flight Controller (FC) - HiModel Mobile
Amazon.com: FPVDrone 3DR 500MW Radio Telemetry Kit 915Mhz Air and Ground Data Transmit Module for APM 2.6 APM 2.8 Pixhawk Flight Controller : Toys & Games
Arducopter Quickstart Guides and Tips - Arduino based Arducopter UAV, the open source multi-rotor
Archived:APM 2.5 and 2.6 Overview — Copter documentation
Arducopter Quickstart Guides and Tips - Arduino based Arducopter UAV, the open source multi-rotor