Holy Stone HS420 Mini Drone User Manual


Holy Stone HS420 Mini Drone User Manual



Check Before Use

  1. This product is a high precision drone that integrates various electronic stability and control mechanisms. Please be sure to configure this drone carefully and correctly to ensure safe, accident-free operation.
  2.  Ensure that the batteries of the drone and transmitter are clean, undamaged and fully charged before every use.
  3. Ensure that all the propellers are undamaged and are installed in the correct orientation.
  4. Ensure to do a thorough check of the product before each use. Inspect the integrity of the parts, any signs of cracks and wear of the propeller, battery power and effectiveness of the indicator, etc.

Operation Requirements

  1.  DO NOT use this product to follow any moving vehicles.
  2. During the flight, turn off the motors only in case of an emergency.
  3.  Fly the drone back to you as soon as you are notified that the battery is running low.
  4.  This product should not be used while drinking alcohol or consuming drugs, if you are feeling fatigued, taking medicine, or feeling any physical discomfort.
  5. Be aware of the volume of noise that the drone produces. Please ensure to keep your distance to avoid ear damage.




  1.  Clean the product after each use with a clean, soft cloth.
  2.  Avoid prolonged exposure to direct sunlight and avoid buildup of heat on the drone or batteries.
  3.  This device is not waterproof and must not be submerged or subjected in water under any circumstance. Failure to keep the device completely dry will result in the failure and permanent damage to the unit. Be aware that although it might be dry where you are, droplets of rain or mist from a river or waterfall could be damaging your drone where it is flying.
  4.  Frequently Check the charging plug and other accessories for signs of damage. If any part of the device or cables are damaged, avoid use or charging until the device can be serviced.






Drone Battery:


As shown in the figure above, install the battery to the buckle on the back of the drone and push it forward. When you hear a click, the battery is installed. Please make sure the battery is securely installed.



As shown in the figure above, hold down the two sides of the battery and pull it back, then remove the battery upwards.


  1. When the drone battery runs low, the indicator lights on the drone will blink continuously, and the transmitter will send out beeps continuously. About 1 minutes, the drone will land automatically.
  2.  When the transmitter batteries run low, the power indicator lights of transmitter will blink continuously, and the transmitter will send out beeps. When this happens, the pilot should replace the batteries for the transmitter.


  1. Connect the battery with the USB charging cable.
  2.  Plug the USB charging cable into a USB charging port on the computer, power bank or USB adapter (5V/0.5-2.0A ).
  3.  When the battery is charging, the indicator light on the USB charging cable is red. When the battery is charged, the indicator light on the charging cable turns green.
  4. The charging time is about 60 minutes.




  • Model: HS420
  • Weight: 31g/1.1oz
  • Max Flight Time: 6 minutes (per battery)
  • Motor Model: 615
  • Operating Temperature Range: 32° to 104°F (0° to 40°C)
  • Dimensions: 84 x 90 x 34 mm


  • Capacity: 300mAh
  • Voltage: 3.7 V
  • Battery Type: Li-Po Battery
  • Charging Temperature Range: 41° to 104°F (5° to 40°C)
  • Charging Time: 60 minutes (Depends on charging power and remaining battery power)


  • Operating Frequency: 2.4 GHz
  • Max Flight Distance: 330 feet/100 m (Outdoors and unobstructed)
  • Operating Temperature Range: 32° to 104°F (0° to 40°C)
  • Battery Type: 1.5V AAA Battery (Not included)


  • Operating Frequency: 2.4GHz
  • Lens Angle: 65°
  • Adjustable lens: -90°~0°
  • Video/Photo Resolution: HD 1280 x 720P
  • Max Transmission Distance: 98 feet/30 m (Outdoors and unobstructed)
  • Live View Quality: 720p@20fps
  • Photo Formats: JPEG
  • Video Formats: MP4
  • Operating Temperature Range: 32° to 104°F (0° to 40°C)


  • Voltage: 5 V
  • Rated Power: ≤10 W


  1. Please read this Disclaimer & Warning and Safety Guidelines carefully before using our product. This product is not recommended for people under the age of 14. By using this product, you hereby agree to this disclaimer and signify that you have read it fully. You agree that you are responsible for your own conduct and any damages caused while using this product, and its consequences.
  2.  When using this product, please be sure to strictly abide by the specification requirements and safety guidelines stated in this document. Any personal injury, property damage, legal disputes and all other adverse events caused by the violation of any of the safety instructions.


  1.  Failure to follow all the instructions may result in serious injury, irreparable damage to the battery may cause a fire, smoke or explosion as well.
  2.  Always check the battery’s condition before charging or using it.
  3.  Replace the battery if it has been dropped, or any odour, overheating, discolouration, deformation or leakage happens.
  4.  Never use anything other than the approval LiPo charger the battery. Always use a balancing charger for LiPo cells.
  5.  The battery temperature must never exceed 60°C(140°F) otherwise the battery could be damaged or ignited.
  6.  Never charge the battery on a flammable surface, near flammable products or inside a vehicle(preferably place the battery on a non-flammable and non conductive surface).
  7.  Never leave the battery unattended during the charging process.



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