Equip your 2-4S drone with the HappyModel CrazyF411 F4 Flight Controller. Enjoy flying with its 20A 8Bit 4in1 ESC and ELRS 2.4GHz receiver featuring a high-sensitivity SX1280 frequency chip for low latency, high packet rate, and great range. With a big Mosfet that supports up to 20A currents, this controller is perfect for FPV drones and strong enough for race or freestyle flying. This flight controller lets you update firmware through Betaflight pass-through or WIFI. The 2.4GHz ExpressLRS receiver is equipped with the SX1280 radio frequency chip with high sensitivity, high packet rate, and low latency. The default firmware is ELRS V3.0.1. Get ready to take your drone game to the next level! Browse the rest of our Whoop AIO Boards and our Happymodel gear. Features Integrated serial 2.4GHz ExpressLRS receiver Pre-installed with Bluejay firmware Specifications Flight Controller MCU:STM32F411CEU6 (100MHZ, 512K FLASH) Sensor: ICM42688P or BMI270 (SPI Control) Mount pattern: 25.5x25.5 M2 Size: 32x28x9mm Power supply: 2-4S Lipo battery Built-in 20A Blheli_S ESC each Built-in Betaflight OSD(SPI Control) Built-in UART ExpressLRS 2.4GHz receiver Built-in 5V 1.5A BEC Flight controller firmware target: CRAZYBEEF4DX Weight: 4.97 Onboard 4in1 ESC MCU upgraded to EFM8BB21 Power supply: 2-4S LiPo/LiPo HV (7v/17v) Currents: 20A continuous peak 25A (5 seconds) Support BLHeliSuite programmable Factory firmware: Bluejay 0.18.1 Firmware target: F_H_40_48_v0.18.1 Default protocol: DSHOT150/DSHOT300/DSHOT600 Onboard UART ExpressLRS 2.4GHz Receiver Packet Rate option: 25Hz/50Hz/150Hz/250Hz/500Hz RF Frequency: 2.4GHzAntenna plug: IPEX Telemetry output Power: <12dBm Receiver protocol:  CRSF Default firmware version: ExpressLRS V3.0.1 Onboard voltage and Amperage Meter Settings Voltage meter scale setting 110 Amperage meter scale setting 470 Includes 1x HappyModel CrazyF411 F4 2-4S Whoop/Toothpick AIO Flight Controller w/ 20A 8Bit 4in1 ESC - ELRS 2.4GHz (UART) 2x Wire 1x Hardware Set 4x Grommets Wiring Diagram & Binding Procedure Binding procedure Supply power to the flight controller by plug USB, wait until the green LED on the FC is off, immediately turn off the power, and then repeat again the above steps. When the FC is powered on for the third time, the green LED light will start to double-flash, which means that the RX enters the binding mode Please make sure your ExpressLRS tx module firmware is v3.x.x. And go to ExpressLRS.lua from “TOOLS” menu of your radio transmitter. Then hit [Bind] to binding with the onboard ExpressLRS receiver. The green LED should blinking slowly first then turn to solid, that means binding was successfully. If the green led still keep double flash after binding ,please change Model Match tab value from “off” to “on” or from “on” to “off” Receiver LED status meanings Green LED solid means bind successful or RC link established; Green LED double-flash means get into bind mode; Green LED flash slowly means no RC signal input from TX module; Green LED continuous flash fast means ExpressLRS wifi enabled. Bind successful   Bind Mode No RC Input Wifi Mode