If you do not have GH1.25 3DR Power Module ,please select R15 M8N PDB Package. Note: Pixracer must be powered by Power Module, and ESC with BEC cannot be used to power pixracer,Because the circuit board is designed like this. So please use 3DR Power Module for power supply. The Pixracer is the common name for the FMUv4 generation of autopilots. It has been designed primarily for the demanding requirements of small multicopters, but of course can be used on planes and other vehicles which require no more than 6 pwm outputs for controlling escs and motors. Many people mistakenly believe that the PixRacer is just a standard "racer" controller that lacks many of the functionalities of a complete autopilot system. Well, don't be fooled! PixRacer has all the capabilities of the original -including version 2- and even more! But is optimized in size and has the right amount of input/outputs that allows you to switch from a full enriched autopilot stack system -with autolanding and full navigation- to a high-performance racing platform. Yup, if you get tired of advanced waypoints, then flip the switch and race like ! R15 has an updated accelerometer/gyroscope, magnetometer and ROHS (Lead Free). Color: As Shown Material: plastic Package Contents: 1 * Pixracer R15 Flight controller 1 * M8N GPS 1 * Safety switcher and Buzzer 1 * Cables set (GH1.25 6P Line+GH1.25 4P Line + GH1.25 5P Line) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.