iFlight Defender 25 O4 HD BNF — 2.5" Ducted Sub-249g FPV Drone, DJI O4 Air Unit Pro, BLITZ F7, GPS, Ships from US
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Sub-249g Ducted Micro FPV Drone — DJI O4 Air Unit Pro, BLITZ D25 F7 AIO, 2.5" Ducted Props, GPS, 100km/h, Ships from US
The iFlight Defender 25 O4 HD is a compact, sub-249g ducted micro FPV drone that combines the safety of fully enclosed propellers with the performance of DJI O4 digital video. The 2.5-inch ducted prop design protects both the props and surrounding objects — making it ideal for indoor flying, proximity freestyle, and environments where prop strikes are a concern. At just 130g airframe weight (201g AUW with 550mAh battery), it stays under the 249g threshold for simplified regulatory requirements. The DJI O4 Air Unit Pro delivers 1080p/100fps H.265 video with D-Log M, RockSteady 3.0+ stabilization, and up to 15km FCC transmission range. Powered by the BLITZ D25 F7 AIO flight controller and Defender25 1404 motors, it reaches 100km/h in manual mode. Built-in multi-constellation GPS (GPS+SBAS+Galileo+QZSS+Glonass) adds position hold and return-to-home safety. Ships from the United States.
Key Features
- Sub-249g AUW - 201g with 550mAh / 230g with 900mAh battery
- 2.5" Ducted Propeller Design - Fully enclosed props for indoor safety and proximity flying
- DJI O4 Air Unit Pro - 1/1.3" sensor, 155° FOV, 1080p/100fps H.265, D-Log M, 15km FCC, 130Mbps
- RockSteady 3.0+ Stabilization - Smooth footage even in tight spaces
- BLITZ D25 F7 AIO - Compact all-in-one FC stack for micro builds
- Defender25 1404 Motors - Efficient brushless motors for 2.5" props
- 100km/h Max Speed (Manual Mode) - Punchy performance for a micro drone
- Built-in GPS - GPS+SBAS+Galileo+QZSS+Glonass for position hold and RTH
- ~6 Min Hover (550mAh) / ~10 Min (900mAh) - Battery-dependent endurance
- 3500m Max Takeoff Altitude - High-altitude capable
- 4GB Built-in Storage + microSD up to 512GB
- Ships from United States - Fast domestic delivery
Variant Options
- With ELRS 2.4GHz RX - ExpressLRS 2.4GHz receiver installed, pair with any ELRS 2.4GHz transmitter
- No RX (For DJI RC) - No receiver, use with DJI FPV Remote Controller 2/3 via O4 system
DJI O4 Goggle & Controller Compatibility
- DJI Goggles 3 / DJI Goggles N3 + DJI FPV Remote Controller 3
- DJI Goggles 2 / DJI Goggles Integra + DJI FPV Remote Controller 2
- Any ELRS 2.4GHz radio transmitter (ELRS variant)
Perfect For
- Indoor FPV flying with prop protection
- Proximity freestyle and tight-space flying
- Pilots wanting sub-249g DJI O4 digital video
- Micro FPV racing with GPS safety features
- Beginners wanting a safer ducted micro drone with pro video
Technical Specifications
- Brand: iFlight
- Model: Defender 25 O4 4S HD
- FC: BLITZ D25 F7 AIO
- Video System: DJI O4 Air Unit Pro
- Frame: 112±2mm
- Prop Size: 2.5 inch (ducted)
- Motors: Defender25 1404
- Airframe Weight: 130±5g
- AUW (550mAh): 201±5g
- AUW (900mAh): 230±5g
- Dimensions: 158×155×69mm
- Max Speed: 100km/h (Manual Mode)
- Max Takeoff Altitude: 3,500m
- Max Hover Time: ~6 min (550mAh) / ~10 min (900mAh)
- Max Flight Distance: 2-3km
- GNSS: GPS+SBAS+Galileo+QZSS+Glonass
- Antennas: Dual
- Image Sensor: 1/1.3-inch
- FOV: 155°
- Video Resolution: 1080p/100fps H.265
- Max Video Bitrate: 130Mbps
- Color Mode: Normal / D-Log M
- Max Transmission Range: 15km (FCC) / 8km (CE/SRRC)
- Built-in Storage: 4GB + microSD up to 512GB
- Operating Temperature: -10°C to 40°C
- Cell Count: 4S
Important Notes
- Battery not included — compatible with 4S 550mAh or 900mAh LiPo
- DJI Goggles and RC controller sold separately
- Sub-249g AUW may reduce registration requirements in some regions — verify local UAV regulations
- For civilian use only — comply with local airspace rules
- Recommended for ages 14+
Shipping Policy
Estimated Delivery: Orders typically arrive within 3-7 business days to most locations in North America.
International Shipping: Available with tracking. Transit times vary by destination.
Return & Guarantee Policy
Money-Back Guarantee: Not satisfied? We offer a 30-day return policy for a full refund or exchange.
Technical Support: Need help with compatibility or setup? Contact our FPV experts for free assistance.