• Optical Flow technology — Provides horizontal control stability at altitudes up to 10 meters (30 feet).
  • Altitude Hold — Holds the quadcopter's altitude at a chosen height after releasing the transmitter's throttle stick.
  • Auto Take-off and Land — Take off and land automatically with the push of a transmitter button.
  • Headless Mode — The Sync 251 always moves in the same direction that you move the controls with this feature activated.
  • SAFE® technology — SAFE® (Sensor Assisted Flight Envelope) technology lets you program the Sync to minimize control challenges automatically while you’re learning. (SAFE cannot be turned off in the Sync.)
  • Integrated LEDs — LEDs glow for easy tracking and orientation.
  • Long flight times — Spend more time in the air.
  • MR210 Full range radio transmitter with:
    • LED indicators for Tx battery power status, binding progress, low/high rates on or off, optics on or off.
    • Signal loss warning (audible beep).
    • Auto-flip function (press and release top right button; move right stick in the direction desired to flip).
    • Picture button (press once to take a static photo)
    • Video button (press for one second to start/stop video)
    • Optical Flow on/off (default setting is ON)
    • Headless Mode on/off (default setting is OFF)
    • Auto start/stop, take off, and land (by pressing top right button)
    • Aileron and elevator control and trims
Sync 251 UAV Drone RTF
Photo of the Sync 251 UAV Drone and all included items.


  • Assembled Sync drone
  • MR210 2.4 GHz transmitter
  • 1S LiPo battery and USB charger
  • (4) AAA batteries
  • (4) Extra blades
  • Screwdriver


  • Completion Level: RTF (Ready-to-Fly)
  • Main Rotor Head Type: Multi-Rotor
  • Main Motor Type: Brushed
  • Battery: 3.7V 1S 900mah 30C LiPo
  • Length: 251mm diagonal
  • Width: 251mm diagonal
  • Main Frame Material: Plastic
  • Flying Weight: 128g (4.5 oz) with battery
  • Approximate Flight Time: 10 min
  • Number of Channels: 4
  • Experience Level: Beginner
  • Recommended Environment: Indoor/Outdoor
  • Is Assembly Required: No

USB Charger Specifications:

  • Input: 5V/1A
  • Output: 3.7V/850mAh
  • Charging indicator: Rapid flash when abnormal
  • Charge time: Less than 90 minutes