I use these small
inexpensive blinkers (~$16 red + white pair from Amazon - NFI). They attach to the bars with a rubber band, but also contain a clip for hooking onto a jersey pocket. I stuck a GoPro mount on the back because reasons. USB rechargeable, multiple blink modes, weatherproof. I run the white front when I'm coming back through town (too many distracted drivers cruising for parking spaces), at low light or in the rain. They're good for 8-10 hours on a charge.
