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Streamlight

Streamlight 66318 MicroStream 45-Lumen Everyday Carry Pocket Flashlight with AAA Alkaline Battery, Black

  • Based on 12,255 reviews
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Availability: In Stock.
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Arrives Friday, Apr 24
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Features

  • Anodized Aluminum
  • Made in the USA or Imported
  • Type II MIL-SPEC abrasion and corrosion-resistant anodized aircraft aluminum construction with unbreakable, scratch-resistant polycarbonate lens
  • Ultra compact design fits in the palm of your hand, comfortably fits in your pocket
  • Type II mil spec abrasion and corrosion resistant anodized aircraft aluminum construction with unbreakable, scratch resistant polycarbonate lens
  • Removable pocket clip also clips onto brim of hat for hands free use

Description

The Microstream is a compact single AAA alkaline battery powered flashlight designed for use in all markets. It features a tail cap switch, momentary or constant on operation, a combination pocket/hat clip for convenience, and amazing brightness and run time for a light of its size and price. The aluminum housing with Type II Military Spec anodizing helps make the light extremely durable and abrasion resistant. Compact and lightweight, the Streamlight MicroStream is a portable penlight with a super- bright, high-flux LED that lasts up to 30,000 hours. Featuring a tail-cap switch for single-handed operation, and durable and water-resistant materials for use in extreme conditions, the Streamlight MicroStream Penlight is ideal for daily use at home or at work.Powerful Performance in a Petite Package Weighing just 1.04 ounces, the Streamlight MicroStream Penlight is small enough to fit easily and comfortably in your pocket, purse, backpack, or tool bag. You can also clip it to your pocket for easy access, or use the included key ring or safety lanyard for convenient portability. Powered by one "AAA" battery (included), the MicroStream produces 20 lumens of light with a battery run time of 1-1/2 hours, and the 1/2-watt LED will last 30,000 hours.The Advantages of LED Light An LED is ideal for a light that gets used on a daily basis. You don't have to worry about breaking the light, since there is no glass or filament, and you rarely have to replace LEDs because they can last a lifetime. Save time and money on batteries as well--they will last much longer with an LED than with a regular light bulb.Innovative Technology Provides Bright, Powerful Illumination With Streamlight's specially engineered reflector, proprietary Micro Optical System (MOS) for optimized output and run time, and battery-booster electronics, the MicroStream produces a bright and powerful beam of light that is more intense than most LEDs on the market.Push Button for Convenient Operation Designed to keep out dust and other particles, the rubber, push-button tail cap is quick and easy to use with one hand. Depress the tail cap slightly for a momentary light, or click into the constant-on position. With a comfortable, tactile feel, the convenient push button is also stiff enough that it won't accidentally turn on in your handbag or pocket.Durably Constructed for Use in Extreme Conditions Machined from solid, aircraft-grade aluminum, the MicroStream is corrosion and water resistant, and features an unbreakable and scratch-resistant polycarbonate lens. Arriving with an unbreakable pocket clip, the MicroStream is ideal for use in automotive, hardware, law enforcement, security, sporting, and outdoor applications. It's been extensively field tested and drop-test verified above the industry standard of 6 feet. The Streamlight MicroStream Penlight is backed by a manufacturer's limited lifetime warranty.What's in the Box Streamlight MicroStream Penlight, key ring, safety lanyard, and one "AAA" battery. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); From the Manufacturer Streamlight Micro Stream LED Pen Flashlight features a super bright, high flux, 1/2 watt LED and has a lifetime of up to 30,000 hours as well as never needs to be replaced. It consists of micro optical system which facilitates optimized output and run time. This flashlight is corrosion and has waterproof construction with an unbreakable polycarbonate lens as well as pocket clip. It consists of rubber push button tail cap on-off switching. See more

Special Feature: Non-Rechargeable, Water Resistant


Color: Black


Power Source: Battery Powered


Light Source Type: LED


Material: Aluminum


Additional Features: Non-Rechargeable, Water Resistant


Power Source: Battery Powered


Light Source Type: LED


White Brightness: 45 Lumens


Voltage: 1.5 Volts (DC)


Light Path Distance: 41 Meters


Battery Type: Alkaline


Number of Batteries: 1 AAA batteries required. (included)


Water Resistance Level: Water Resistant


Light Source Special Features: Momentary/Constant On Modes


Battery Description: Alkaline


Runtime: 2 hours


Number of Light Sources: 1


Light Source Wattage: 0.15 Watts


Batteries are Included: Yes


Mounting Type: Cap Mount or Pocket Clip


Item Dimensions D x W x H: 3.5"D x 0.6"W x 0.6"H


Item Weight: 1.04 Ounces


Item Dimensions L x W x H: 3.5"L x 0.6"W x 0.6"H


Material Type: Aluminum


Included Components: Battery, Clip, Flashlight, User Guide


Model Number: 66318


Brand Name: Streamlight


Recommended Uses For Product: Camping, DIY, Home Defense, Industrial, Safety & Security


Global Trade Identification Number: 83


Manufacturer: Streamlight


UPC: 080926663183


Item Type Name: Microstream Flashlight


Unit Count: 1.0 Count


Manufacturer Warranty Description: Limited lifetime warranty.


Color: Black


Shape: Round


Style Name: Clear Retail Packaging


Finish Types: Black


Warranty Type: Limited Lifetime Warranty


Specification Met: ANSI, CE, IPX4


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Apr 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews

    • Great flashlight !!
Great surpresa! It is small and has a potent bright light and several sets to use! Good material! Cheap to recharge!!
Reviewed in the United States on February 11, 2026 by Miss Astor
    • Cannot beat it
Well.. Wow. I do not know why it took me so long to order one of these, given their reputation. But I was only doing myself a disservice. I regularly carry a Fenix PD35 2014 Edition 965 Lumen 2xCR123A light in my left pants pocket, but it is both a drain on the pricey batteries and incredibly overpowered for your standard "I dropped something in the dark" kind of a thing, so I also always carry something else in the 9o'clock-most corner of my left rear pocket. After trying 2 and 1 AA lights I found the barrel diameter sufficient to be annoying, and moved to 2-AAA penlights. After trying several and chipping a tooth doing something with one in my mouth and something falling on the light, one with a hat clip became ideal. Enter the MicroStream, the pocket clip is excellently designed (most others rip off rather soon for me, this one has yet to even have the finish scratched) and does in fact work extremely well. Ontop of that, the momentary and constant on capabilities are done with a touch of quality one expects out of any Streamlight, Surefire, Fenix etc. without compromise from the lights size. Additionally, it is so light that I genuinely do not notice it's either in my pocket or clipped to my hat, even the HAT suffers no noticeable weight variation nor does the clip dig in to you. To top it all off, it's bright enough to shine at the ceiling and illuminate a dark room well enough to get dressed, shave, tie your tie, and be out the door. I did just that this weekend with no problems. The battery life is surprisingly long, and best of all its powered by ONE AAA (Duracell Procell for me) which makes more/spare batteries as easy and cheap as can be. I've also dropped it from about 6 feet onto a curb and then asphalt, on accident, and it didn't even scratch the finish much less affect functionality. For the price point, the fit finish and function being unsurpassed, and the assurance of StreamLight customer service, if you don't own one and are looking for a light of this species, stop looking. Don't waste your money on anything less than the Streamlight Microstream. ... show more
Reviewed in the United States on February 23, 2016 by squeezedontjerk
    • Best $20.00 EDC 1- AAA form factor light there is!
There are two items that are ALWAYS in my pocket, a small EDC pocketknife and this particular Streamlight C4. I have a drawer full of expensive and not so expensive lights, let me save you trouble, money and wasted energy on auditioning others...This is the PERFECT EDC light. Lets start with the switch, press down slightly for momentary on and more firmly for constant on, much more firmly. The switch is strong enough that it will not inadvertently get pressed on even if you carry it clipped to your front pocket or carried loose in the pocket itself. Nothing as aggravating as having your light come on and deplete the battery by the maker putting a soggy, weak on/off push button switch on it. This light is as bright as the 2 AAA form factor, clips and stays perfectly in a Carharrt T-Shirt pocket and lasts for at least a week of occasional use when loaded with the fantastic Eneloop AAA rechargeable battery's. The pocket/hat clip is "S" shaped so it clips to your pocket or hat brim or shirt allowing hands free use. The clip is as robust as the switch, I have yet to "Spring" one by clipping it to too thick of an object and it stays put in a shirt pocket when you clip it in there. Yes, someone mentioned that it scratches the barrel of the light when you unscrew it to change batteries, the face of my hammer gets scratched when I hit a nail also, its a tool, not a piece of jewelry, I don't notice it. I t is also lightweight enough to stick in your mouth when you don't have a cap on, I just wash mine off with a sponge and a little dish soap when I think about it. Have been using it like this for years with out any ill effects or chipped teeth :) The LED is covered by a hard piece of clear glass which is nicely protected by the barrel of the light extending past it by a little bit. All in all, I believe no AAA or AA form factor lights can stack up to the perfect list of features this little light offers , all this for less that $20.00 this is as good as any EDC light gets. I have lights made by 4Sevens, Fenix, Surefire, etc. and would not trade my little C4 for any of them. It does not have a flat base so it will not "Tailstand" , this is one overrated feature of lights anyways, I would prefer the stiff exposed switch the C4 has to this ability. If I want a "Tailstand" light I will light a candle :). Bottom Line: Buy this light, you will not be disappointed. I buy them as gifts for friends and family, great for the favorite women in your life to keep in their purse or key chain and any man would certainly love one as a present. I was walking from my truck to the house the other night and would have surely stepped on a 18" copperhead snake in my front yard, in flip flops no doubt! if I had not had this light in my mouth showing the way, I had a load of groceries in each hand.... ... show more
Reviewed in the United States on June 30, 2016 by Jerry M. Honeycutt Jr.
    • Excellent Little Flashlight
It's bright and the battery lasts plenty long; it's durable, and I don't worry about it's getting damaged. I have a canvas leatherman pouch I keep on my belt; it has loops on either side of the the leatherman tool holder itself. In one loop, I keep a ratcheting extender. In the other loop, I keep this flashlight. I can leave it in the loop and press the button when I need to illuminate things I can point at by moving the holder slightly. This happens fairly frequently as I help my elderly parents up and down the outside stairs and it's helpful to be able to light them up. It is very nice to have access to a bright light source all the time, and this flashlight makes that easy. ... show more
Reviewed in the United States on September 22, 2025 by Nathan Oliver

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