small, light, flashing lights for daytime

I'm looking to get some blinking lights for daytime riding. Small, light (weight), preferably USB rechargeable, lights. Are the Knog Blinder 1's any good? Are they bright enough to get seen in the daytime? Or what other ones are there that are good? Thanks.
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I currently use a Hope Vision 1 as a main beam and a Cateye Uno as a helmet light. However, I need a flashing light, as the one I use for this purpose is on its way out.
Or would a Lezyne Zecto Drive front be any better? Any other ideas?
Very much so. I currently have a Micro Drive on the front, with my Mega Drive, but, if the quality of the Blinder R on the rear I have is anything to go by, the front should be excellent.
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Small, bright, easy on/off, no reports of snapping rubber bits (unlike Knog), USB charge, pulse mode etc.
http://road.cc/content/review/116626-li ... rear-light
http://www.wiggle.com/lifeline-usb-led- ... light-set/
The Knog website says about the Knog Blinder 4, "3 hrs (steady), 50 hrs (flashing)". (Is that the same as the Blinder 4s? I think so.) So that 50 hrs flashing statement is either rubbish or it's on some super low setting -- going from what you say Nick_M.
Which, incidentally, completely ruins AA batteries....
Should always drain old style Ni-MH and Ni-CD AA/AAA batteries completely before charging or you'll find they only hold a fraction of the charge they used to.
Completely the opposite for modern Lithium Ion (Li-Ion) style batteries where completely draining them destroys them.