Used both lights and the battery life of lights were adequate for a 3-4 hour ride. Unfortunately one unit fell off the bike during the ride. USB recharger is for one light only. So you will need to charge each unit after a ride. The product was easy to use and charging is simple. Has white and red color light that are steady or blinks. Blinking uses up more life of the battery.
I agree with the other reviewer. Blackburn is really good about replacing their stuff. I must have received 4 new Fleas over the years. And I hated tat magnetic charger.
The new setup is really good and I've been happy with the light as a tail light. Requires charging fairly often, every 3 rides in my case (about 5 hours more or less).
Awesome small size,Floodlight pattern wide.Red for rear,interchangable color in both.Put em both up front and BE SEENSEE FOWARD..Wont out run em.Best of all,runs along timerechargable..Awesome wo battery packsSpare batterys.
I have been using Blackburn lights for the past 5 years. Not because they're particularly great, but the warranty is awesome. Blackburn replaced (one of) my non-functioning Flea sets with a pair of 2'Fers about a month ago and I'm perfectly happy with them. These are a nice upgrade from the Fleas since they fixed my two biggest issues - charging and the button. These charge with a normal micro USB charger (instead of that goofy dongle the Fleas use) and the button has a nice feel to it (not much travel).
Having both red and white lights in a single unit has come in handy a few times, so that's cool - these clip on to my dogs' harnesses so I'll have them flashing red on runs but I can still take them off and switch to white in case I need a flashlight.
I've only tested the batteries to 3 hours of flashing and they handled it just fine. 5 hours might be a stretch. As with the Fleas, the solid white is pretty wimpy (at only 60 lumens), so I use it in strobe mode paired (to be seen) with a more powerful 700 lumen headlight (to see).
I recently lost one of these lights and immediately wanted to replace them since they are great lights with easily being charged with UBS connection, always can store in a pocket and pull them out when needed, and can flash both red or white for front or back. I figured I better replace sooner than later not knowing if Blackburn was going to continue in their product line.