4Sevens Preon ReVO LED Flashlight Review

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The Preon ReVO from 4Sevens is the latest mini sized keychain flashlight that packs quite a punch for its diminutive size.

The first thing that stands out, besides its tiny size, is that it takes a common AAA battery, which you can find almost anywhere.

Here are the specs:

  • LED: CREE XP-E R2 Emitter
  • Six modes of output
    • Low: 1.5 lumens, 2.8 days
    • Medium: 19.8 lumens, 5.7 hours
    • High: 82 lumens, 0.9 hours
    • Strobe: 2.5 hours
    • S.O.S.: 2 hours
    • Beacon: 48 hours
  • Dimensions
    • Length: 2.8 in
    • Diameter: 0.5 in
    • Weight: 0.46 oz
  • Power: One AAA battery (included)
  • Operating Voltage Range: 0.9V~1.5V
  • Material: Type III, hard-anodized aircraft-grade aluminum
  • Lens: Optical grade glass lens with anti-reflective coating

It comes with a battery, keyring, and spare O-ring.

The bottom of the Preon ReVO has the keyring attachment.  The bottom is flat but not very wide.  You could balance it on end like a candle, but it’s not very stable.

The Preon ReVO has no button switch.  Instead, you twist the front end once for low, again for medium, and a third time for high.  If you do this low/medium/high cycle twice, you enter into the flashing modes of strobe, SOS and a beacon (blinks once every 10 seconds).

I compared the Preon ReVO against a cheap plastic keychain light I already had.  Here are the results taken in a darkened room.  The wall is about 6 feet away.  Camera was set to the same manual exposure each time.

Left: Preon ReVO on LOW. Right: cheap LED squeeze light
Left: Preon ReVO on MEDIUM. Right: cheap LED squeeze light
Left: Preon ReVO on HIGH. Right: cheap LED squeeze light

In this case, the cheapie LED squeeze light was brighter than the Preon ReVO on the lowest setting, but the Preon ReVO blasted far more light in the medium and high setting.

Will I keep this?  To be honest, I’m not too thrilled about the twisty on/off switch.  I prefer pushbuttons.  But that’s just a preference.  My wife was happy to make this part of her purse arsenal due to its small size and high output.  At $47 it’s not cheap for a “just a light” but I think the price is just right if you need that extra “oomph” at your keychain.


Product Information

  • Really bright for something that takes only 1 AAA battery.
  • Doesn't stand up on end very well. Some may not like the twisty power switch.

5 thoughts on “4Sevens Preon ReVO LED Flashlight Review”

  1. Gadgeteer Comment Policy - Please read before commenting
  2. Love how bright it gets with only 1 AAA battery. Just a question on the twist on/off. Does it click in place on each setting? And does it require a bit of force to twist? Just don’t want it to be turning on in my pocket by accident and drain all the battery.

  3. For a bright, cheaper light, you can check out the ITP A3 EOS light. Running on a single AAA battery, and weighing less than 1/2 oz without battery, it’s as light as you can get. It’s the twist type, and has low medium and high settings.

    At the highest setting, it outputs 80 lumens, which makes it as bright as the Revo, but at less than half the price. The ITP doesn’t do strobes, but it’s still a great little light.

  4. Jackie, the light does not click. It’s just a threaded connection. It’s not too hard to turn the head. I have the same concerns.

  5. Aww…wish it did have a click wheel. Plus I’m not a huge fan of twist to turn on flashlights. Anyone seen the Tri-V flashlight? That flashlight is totally awesome…and extremely expensive since it’s custom made with cnc aluminum.

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