Happymodel Mobula7 O4 2-Inch 2S Digital HD FPV Whoop with DJI O4 Air Unit and ELRS 2.4G Receiver

Overview

The Happymodel Mobula7 O4 is a compact and powerful 2-Inch 2S Digital HD FPV Whoop designed for indoor freestyle and backyard flying. Featuring the latest DJI O4 Air Unit, it delivers ultra-smooth 1080p video at up to 100fps, providing exceptional clarity and low-latency FPV experience. With its high-performance RS1102 KV10000 brushless motors and durable HQProp 45mm tri-blade propellers, this 2-inch drone offers efficient thrust, agility, and stability. The integrated ExpressLRS 2.4GHz receiver ensures reliable control, making the Mobula7 O4 ideal for beginners and experienced pilots alike.

Key Features

• 2-Inch Micro Whoop Frame (80mm wheelbase) for tight-space agility

• DJI O4 Air Unit supporting 1080p@100fps live feed and strong penetration

• RS1102 KV10000 motors with 45mm tri-blade props for efficient 2S power

• CrazyF405HD ELRS FC with built-in 12A ESC, blackbox, barometer, and sensors

• Built-in ExpressLRS 2.4GHz receiver with up to 500Hz refresh rate

• Lightweight and compact design ideal for indoor and micro freestyle flight

Specifications

Motor

• Model: RS1102 KV10000

• Configuration: 9N12P

• Stator Size: 11mm × 2mm

• Shaft Diameter: 1.5mm

• Dimensions: Φ13.5mm × 14mm

• Weight: 2.8g (each)

• Battery Support: 1–2S LiPo

Propellers

• Brand: HQProp

• Diameter: 45mm (≈2 inch)

• Pitch: 0.9

• Hub Thickness: 5mm

• Shaft Size: 1.5mm

• Weight: 0.33g (each)

• Material: Polycarbonate

Flight Controller

• Model: CrazyF405HD ELRS

• MCU: STM32F405RGT6 (168MHz, 1MB Flash)

• Gyro: BMI270 (SPI)

• Mount Size: 25.5mm × 25.5mm

• Power Input: 1–2S (2.9V–8.7V)

• ESC: 12A x 4 (BLHeli_S, Bluejay firmware)

• ESC Protocol: DSHOT300

• Blackbox: 8MB

• Barometer: BMP280

• Voltage Sensor Scale: 110

• Current Sensor Scale: 470

Receiver (ELRS 2.4GHz)

• Version: ExpressLRS V3.0.1

• Target: HappyModel EP2400 RX

• Antenna: 31mm copper wire

• Power Output: <12dBm

• Frequency: 2.4GHz

• Packet Rates: 25–500Hz

DJI O4 Air Unit

• Weight (w/ camera): ~8.2g

• Transmission Module: 30×30×6mm

• Camera Module: 13.44×12.36×16.5mm

• Frequency Bands: 5.170–5.250GHz / 5.725–5.850GHz

• Output Power:

  • 5.1GHz: <23dBm (CE)

  • 5.8GHz: <30dBm (FCC), <14dBm (CE)

• Live View: 1080p @ 30/50/60/100fps

Package Includes

Important Notice

Due to DJI’s official warranty policy, any issue with the O4 Air Unit must be serviced in mainland China. Please consider this before purchasing.

DJI Remote Controller Compatibility

To use DJI FPV Remote Controller, flash Betaflight firmware with SBUS support, apply the factory CLI dump, and set the proper UART for SBUS—no hardware modifications needed.

Firmware Flasher settings for BETAFLIGHTF4, version 4.5.1. Options include full chip erase, manual baud rate of 256000, and SBUS radio protocol selection.

Ports configuration for Happymodel Mobula7 O4. UART1 set to 115200 with VTX (MSP + D) enabled. Serial Rx on UART6 activated. MSP on first serial port should not be disabled without caution.

Receiver settings for Happymodel Mobula7 O4: Serial (via UART) mode, SBUS data format selected. Telemetry output option available.