Here is a review of an interesting safety device that seems useful: My daughter bought a Brake Free helmet light for my birthday at the recent Northern California Motorcycle Show during a visit to the company's exhibit. It connects to the back of your helmet via a permanent stick-on clip and is easily removable by pulling upward to remove or pushing down to connect. It is completely self-contained and does not need any sort of transmitting device to be connected to the motorcycle as was the case with a similar brake light that was on the market a few years ago. It contains a non-replaceable rechargeable battery that is said to last for 9 hours of operation on a charge. Recharging takes 2-3 hours via a USB port.
The device lights up when you slow down with a large series of 100 red LEDs. It is sensitive enough so that it will flash on at a walking pace and then coming to a stop. You can also purchase two additional helmet clips for $13. You get one clip with the Brake Free light and I was given a package of 2 extra attachment clips. I now have the clips fastened to three of my helmets so that I can move the brake light from one helmet to another. There is a mode button at the top of the Brake Free light, which allows you to turn it on and then cycle through three modes: all LEDs on; all LEDs blinking; and a "stealth" mode with just 16 LEDs when steadily riding but with all 100 LEDs flashing when slowing down, which is the one that I like to use. Pushing the button again will turn the light off for storage or recharging.
The light seems like a good safety device for my type of riding, which can be in heavy fog at times and when slowing down while riding my Zero electric motorcycle and using its regeneration feature, which does not turn on the bike's brake light unless you operate bike's brakes to come to a stop.
If you are interested in checking out this brake light, here is a link to the company's website: brakefreetech.com.
Unfortunately, the device is not cheap. Its price is $170 USD. But I don't think there is anything else like it on the market and it seems to be well made and it does function as claimed.
