At first I got one with the leds on the license plate that is tied into the brake/running light.
Then I added one of the motion-activated ones too. This one seems to give some "false" flashes on bumps and deceleration BUT it still reminds drivers there's a bike in front of them.
The links are
here for the Brake Flasher.
and
here for the Signal Dynamics plate frame.
They're both nicely made in the USA.
