The Pixracer is the common name for the FMUv4 generation of Pixhawk 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. Includes an ESP8266 for easy WiFi Updates. Comes with the latest Ardupilot ESP8266 firmware developed by Andrew Tridge. This firmware has a nice web interface, MavLink2 support and an easier way to do future updates via the web interface. Interfaces/Connectivity Wifi: ESP-01 802.11bgn Flashed with MavESP8266 MicroSD card reader Micro-USB RGB LED GPS (serial + I2C) TELEM1/TELEM2 Wifi serial FrSky Telemetry serial Debug connector (serial + SWD) Connectors: GPS+I2C, RC-IN, PPM-IN, RSSI, SBus-IN, Spektrum-IN, USART3 (TxD, RxD, CTS, RTS), USART2 (TxD, RxD, CTS, RTS), FRSky-IN, FRSky-OUT, CAN, USART8 (TxD, RxD), ESP8266 (full set), SERVO1-SERVO6, USART7 (TxD, RxD), JTAG (SWDIO, SWCLK), POWER-BRICK (VDD, Voltage, Current, GND), BUZZER-LED_BUTTON. Power System: 5-5.5VDC from USB or PowerBrick connector. Optional/recommended ACSP4 +5V/+12V Power Supply. Weight and Dimensions: Weight: 10.54g (0.37 oz) Width: 36mm (1.42inch) Length: 36mm (1.42inch) Color: As Shown Material: plastic Package Contents: 1 * Pixracer R15 Flight controller 1 * Plastic shell 1 * Safety switcher and Buzzer 1 * Micro4G TFCard 1 * Card reader 1 * Cables set (GH1.25 6P Line+GH1.25 4P Line + GH1.25 5P Line) 1 * ESP8266 Wifi module 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.