The Blackburn 2'fer is a lightweight, USB-rechargeable bike light. Its most unique feature is that it can serve as either a front or rear light.
The light weighs 18 grams. It can clip onto clothing or a pannier and it also comes with a stretchy rubber bracket so it can mount to a seatpost or handlebar.
The light also comes with a short (about 20 cm) micro USB cord for charging. That's a pretty damn short cord but these days darn near every device I own charges with a micro USB cord. After opening the package, I charged the light with the 10 foot USB cord I use for charging my phone and Kindle.
The light is bright. It has 4 modes: White Steady, White Flashing, Red Steady & Red Flashing. The white light is rated at 60 Lumens while the red is rated at 20 Lumens.
A long press turns the light on and off. A quick press toggles the light through its various modes.
Here is the light shining as a tail light at dusk.
And here it is working as a head light. It's quite effective as a be-seen light.
The rubber bracket holds the light securely to the handlebars.
The bracket also works fine on the seatpost.
As a front light, the 2'fer really only works as a be-seen light. The light really doesn't really cast a beam, so you can't really ride at any speed.
Used in conjunction with my Cygolite Dash, it's fine. The Dash lets me see where I'm going while the 2'fer increases my conspicuity.
As a tail light, the 2'fer really shines (pun intended!)
On steady, the 2'fer runs for 1.5 hours, while the strobe mode is good for 5 hours. The light has a super tiny red/orange/green power gauge LED. It takes about 3 hours to fully charge. The short battery life may be a deal-breaker for some but for my relatively short commute it's fine. I just keep and eye on the gauge and charge it at home or work as needed.
The 2'fer is a great be-seen light for the urban commuter. For dark trails or long rides, you'll want something more, but it's a good little versatile light. You can buy it as either a single light or save a bit and buy it in a two-pack.