Streamlight Key-Mate 72101 Flashlight Review

The other day on Facebook, someone posted a photo of the Lumintop GT Nano with the Streamlight Key-Mate 72101 keychain flashlight.  Well, that light was very flashlighty, and interested me greatly, so I went and found it on amazon, and here’s a review!


Official Specs and Features

Here’s a link to the official product page.

Versions

There are a few versions of the 72101.  And there are some filter attachments, too.  The body colors are Black, Titanium (seen here), and Camo.

streamlight key-mate 72101 keychain twisty flashlight versions

Price

I bought mine for $13 on amazon.com (referral link).  You might see them for less elsewhere, but $10-$13 is pretty standard.


Short Review

This is a great fun little light!  With some modification it’d probably be worth the $13 price.  Unfortunately not a ton of modification can be done.  Just a simple 5mm emitter swap would be great, though!

Long Review

The Big Table

Streamlight Key-Mate
Emitter: 5mm (White)
Price in USD at publication time: $13.00 on amazon (referral link)
Cell: 4xLR44
Runtime
LVP? No
Switch Type: Twisty
On-Board Charging? No
Claimed Lumens (lm) 10
Measured Lumens (at 30s) 10 (100% of claim)*
Candela per Lumen 8.2
Claimed Throw (m)
Candela (Calculated) in cd (at 30s) 30lux @ 2.903m = 253cd
Throw (Calculated) (m) 31.8
All my Streamlight reviews!
  • Measurement disclaimer:  I am an amateur flashlight reviewer.  I don’t have $10,000 or even $1,000 worth of testing equipment.  I test output and such in PVC tubes!!  Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included

streamlight key-mate 72101 keychain twisty flashlight what's included

  • Streamlight Key-Mate flashlight
  • Lanyard
  • L1154F cells (4)

Package and Manual

streamlight key-mate 72101 keychain twisty flashlight package

streamlight key-mate 72101 keychain twisty flashlight package opened

streamlight key-mate 72101 keychain twisty flashlight paperwork streamlight key-mate 72101 keychain twisty flashlight paperwork

streamlight key-mate 72101 keychain twisty flashlight paperwork

Build Quality and Disassembly

streamlight key-mate 72101 keychain twisty flashlight feature image

First off, note that this is the “Titanium” branded option of the Key-Mate.  As far as I can tell (and as far as my experience tells me), this light is 100% not titanium at all, and “titanium” is meant to represent the look.  I didn’t expect it to be titanium, but I consider it grossly misrepresentative to name it Titanium without also saying “titanium look” or something to that.  This is not titanium, and really I wouldn’t even say it looks like titanium.  So just consider it named titanium, as if you’d name it George or Potato.

All of that said, you can’t deny how fun this little light is and looks.  it’s very flashlighty, and that’s a feature that I love.  In fact that’s entirely why I bought it.  (Well… more on that later).

streamlight key-mate 72101 keychain twisty flashlight laying on side

The build quality is ok if you don’t really ever open the light.

streamlight key-mate 72101 keychain twisty flashlight headstanding

All these accessories ship attached to the Key-Mate.

streamlight key-mate 72101 keychain twisty flashlight headstanding showing ring

This little key ring connector is pretty nice!

streamlight key-mate 72101 keychain twisty flashlight hanging by chain

Check out the front of the light.  You could guess what all this does to the beam profile (and you won’t be wrong).

streamlight key-mate 72101 keychain twisty flashlight front showing emitter

Both the head and body have ample knurling.  It’s a twisty afterall, so that’s important.  One handed operation is easy.

streamlight key-mate 72101 keychain twisty flashlight tail end

The threads are long and smooth – again, exactly what you’d want with a twisty.

streamlight key-mate 72101 keychain twisty flashlight head unscrewed

Here’s another sign of the build quality.  That spring on the negative end is thin and generally low quality.  On the positive side of things (the right), there’s so much plastic.  So much plastic.  Really the whole setup here internally is plastic, with the leads from the 5mm LED being the contact points.

streamlight key-mate 72101 keychain twisty flashlight head off showing spring and contacts

I’m not saying that’s good or bad, but if you intended to modify this light, then you’ll have to find all of your own internals.  Just a simple LED swap could likely be performed, though.

streamlight key-mate 72101 keychain twisty flashlight plastic guts

streamlight key-mate 72101 keychain twisty flashlight contact points in head

streamlight key-mate 72101 keychain twisty flashlight inside head

Inside the cell tube is a sticker saying “12/18” – I’m unsure what this means, but probably (or “possibly”) a build date.

streamlight key-mate 72101 keychain twisty flashlight sticker inside the tube

Tailstanding is technically possible.

streamlight key-mate 72101 keychain twisty flashlight unreliable tailstanding

All four included cells are required for operation – there are no spares.

streamlight key-mate 72101 keychain twisty flashlight cells installed

streamlight key-mate 72101 keychain twisty flashlight turned on

streamlight key-mate 72101 keychain twisty flashlight on

streamlight key-mate 72101 keychain twisty flashlight lanyard

Size and Comps

Length: 2.36 in. (5.9 cm)
Diameter: Major Diameter: 0.74 in. (1.88 cm)
Body Diameter: 0.57 in. (1.45 cm)
Weight: 0.9 ounces (25.4 grams) (includes cells)

If a light will headstand, I’ll show it here (usually the third photo).  If a light will tailstand, I’ll show that here, too (usually the fourth photo).

You may not have picked up on it til now, but this light is TINY!

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

And here’s the light beside my custom engraved TorchLAB BOSS 35, an 18350 light.  I reviewed the aluminum version of that light in both 35 and 70 format.

streamlight key-mate 72101 keychain twisty flashlight beside torchlab boss 35

Retention and Carry

A pocket clip is included, and not really removable.  It’s a “paperclip style” pocket clip and very tight.  Tight like “hard to use” or even “pointless to try to use.”  Tighter is better though, because at least this way it can be loosened.

streamlight key-mate 72101 keychain twisty flashlight laying on side showing clip

Also included is this keyring on a twisty chain, which again, isn’t really removable.

The chain is a nice infinite-twist chain.  And the ring connector has a gate, not a split ring.  So that’s nice, too.

streamlight key-mate 72101 keychain twisty flashlight hanging from keychain

Finally included is this lanyard.  It’s quite long, not really paracor, and does have a quick release for safety.

streamlight key-mate 72101 keychain twisty flashlight tailstanding

Power and Runtime

The Streamlight Key-Mate 72101 requires four coin cells.  The manual says four LR44 ship with the light, and they ship installed.

streamlight key-mate 72101 keychain twisty flashlight lr44 cells

Each of these is 1.5V, and there are various button cells this size that will work.  A quick search reveals this:

Duracell 76A 1.5V Alkaline Battery Replacement LR44, CR44, SR44, AG13, A76, PX76.  

streamlight key-mate 72101 keychain twisty flashlight lr44 cells

With my purchase of the light, I also bought some replacement cells.  You can get these here – half the price of the light!

streamlight key-mate 72101 keychain twisty flashlight lr44 cells backup

The cells go into the light in the opposite direction of “normal.”  The negative end goes toward the emitter.

streamlight key-mate 72101 keychain twisty flashlight lr44 cells installed properly

Forget dropping these in one by one.  They’ll rotate around and it’ll be a big hassle to get them lined up…

streamlight key-mate 72101 keychain twisty flashlight lr44 cells installed properly

Instead, line the cells in the groove of your fingers as shown below, and then slide the cell tube over.  The orientations shown below are the right way.

streamlight key-mate 72101 keychain twisty flashlight how to install lr44 cells

There’s just one mode, so just one runtime.  The light only claims 10 lumens, and after around 40 minutes it steps down.  From there it really just lasts and lasts – I’m not even showing the whole test here, so that the first 40 minutes aren’t compressed beyond usefulness.  I finally stopped the test, while the light was still on, and was reading 4.2V across the four cells.  That makes it around 1.05V per cell.  I’m not sure what the lower limit of these cells is, but they’re single use – it won’t hurt to discharge them completely.

streamlight key-mate 72101 keychain twisty flashlight runtime graph

Here’s a closeup of the graph above, showing up to the stepdown.

streamlight key-mate 72101 keychain twisty flashlight runtime graph

Modes and Currents

There’s just one mode.  On bench power, set at 6V, the emitter would take way more current than it needed – it’s a direct drive light.  These cell don’t provide all that much current though – at around 0.2A it’s ok.  Above that (say 0.3A) the emitter gets really blue (bluer than it is supposed to be.)

PWM

No PWM is seen!

streamlight key-mate 72101 keychain twisty flashlight pwm graph

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  And here’s the worst PWM light I have ever owned.  Also one of the very first lights I ordered directly from China!

User Interface and Operation

The light is a twisty!  Tighten the head for “on.”  Loosen the head for off.  There is no other option or mode.

streamlight key-mate 72101 keychain twisty flashlight twisty

Here’s a UI table!

State Action Result
Off Tighten On
On Loosen Off

I love easy UI’s. 😀

LED and Beam

The emitter used in this Streamlight is a 5mm domed white LED.  I believe there’s also a green option.

streamlight key-mate 72101 keychain twisty flashlight emitter photo

The mess you see above is a little confusing actually.  There’s a reflector, into which the dome of the emitter protrudes.  So the reflector is pretty smooth, and the LED dome makes it look very ringy.

The LED “legs” just stick into this plastic bit, and make direct contact with the cells.  There is no driver!

streamlight key-mate 72101 keychain twisty flashlight contact points for led

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

streamlight key-mate 72101 keychain twisty flashlight beamshot ceiling (blue)

Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)

Test light is on the left!

streamlight key-mate 72101 keychain twisty flashlight beamshot door

I compare everything to the KillzoneFlashlights.com 219b BLF-348, because it’s inexpensive and has the best tint!

Conclusion

What I like

  • Small size
  • Twist is very smooth
  • Only one mode
  • Excellent throw

What I don’t like

  • Claims titanium; isn’t titanium
  • Blue temperature on the LED
  • Only one mode

Notes

  • This light was provided by me for review. I was not paid to write this review.
  • This content originally appeared at zeroair.org.  Please visit there for the best experience!
  • For flashlight related patches, stickers, and gear, head over to PhotonPhreaks, another site where I write!
  • Use my amazon.com referral link if you’re willing to help support making more reviews like this one!
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Author: zeroair

1 thought on “Streamlight Key-Mate 72101 Flashlight Review

  1. You can also use 2x CR1/3N batteries in this light as well as any that take the 4x LR44. They are lithium so won’t leak and are easier to put in the flashlight. If you shop around there about the same cost as LR44 when you consider you only need 2.

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