Whether deep-sea exploration, hunting or observing underwater nightlife, the Fenix SD20 flashlight is built for all diving activities. Delivering a maximum output of 1000 lumens of white light and 105 lumens of red light, the SD20 is powered by two 18650 rechargeable batteries. With a twist of the flashlight head, users can access three lighting modes and turn the light on and off. Equipped with a rotating magnetic ring for one-hand operation and a battery indicator light, this light offers convenience and assured illumination to divers.

Size    8.18" x 1.02" x 1.57"

Weight    8.64 oz (excluding batteries)

Battery Type    two 18650 rechargeable Li-ion battery

Product Features

  • Uses Cree XM-L2 U2 and Cree XQE Red LED with a lifespan of 50,000 hours
  • Powered by 2*18650 rechargeable Li-ion batteries or 4*CR123A Lithium batteries
  • 208mm length×26mm tube diameter×40mm head diameter (8.19*1.02*1.57 in.)
  • 245g/ 8.64 oz. (excluding batteries)
  • Rotating magnetic ring for one-hand control
  • Dual layer body tube guards against corrosion
  • Integrated white and red light illumination
  • Digitally regulated output maintains constant brightness
  • Intelligent over-heat protection to avoid high temperature of the surface
  • Low-voltage warning reminds when battery replacement is needed
  • Reverse polarity protection, to protect from improper battery installation
  • Tail cap with big buckle for fast and convenient quick draw
  • Made of durable aircraft-grade aluminum
  • Premium type III hard-anodized anti-abrasive finish
  • Toughened ultra-clear glass lens with anti-reflective coating



FAQs about Fenix SD20 Flashlight

    Q1. What is the product positioning of SD20 and who are the target customers?

    A: Fenix SD20 is designed for various underwater illuminating, with a max 1000-lumen output , rotating magnetic ring for switching ON/OFF and three output selection, and plus battery level indicator, SD20 is ideal for hunting, deep-sea exploration and underwater nightlife observing, etc.


    Q2. What are the key features and benefits of SD20?

    a) 100-meter submersible

    b) Rotating magnetic ring for one-hand control

    c) Battery level indicator

    d) Dual layer body tube design



    Q3. What kind of battery does SD20 use?

    A: SD20 not only supports two 18650 rechargeable Li-ion batteries, but also compatible with four CR123A Li-ion batteries. When use the 18650 battery with flat top, you should take the included conducting plat between the batteries to make sure the circuit is well connected.



    Q4. Whats the working voltage range of SD20?

    A: The normal working voltage range of SD20 is 6.5-12V, the limited working voltage is 6.0-12V. 



    Q5. Will SD20 downshift output levels in High?

    A: No, it won’t. With the intelligent over-heat protection, when the light is overheated internally up to 65 ℃ or above, the light will automatically adjust the output to prevent the light from overheating. And then it will automatically increase the output to previous level gradually when the temperature is below 65 ℃.