I like that when you decelerate the unit lights up before you tap the
Brakes.
The brake free unit is a wireless brake light. It's equivalent to a CHMSL only not directly connected to the brakes.
In CA vehicles can be equipped with a
deceleration warning light. This is a device activating one or tow
amber lamps that give an indication of
rate of deceleration and is not a brake light. The two most prominent requirements are 1) red or
amber lights 2) operate only during deceleration and 3) indicate
rate of deceleration. This is what the Cyberlite did.
The granddaddy of all these non-brake connected lights is the c.1980 Voevodsky Cyberlite. It's decelerometer five mercury switches mounted at five different angles on a PCB that activated two bulbs through an amber lens. Each switch responded to a degree of acceleration. The quicker the vehicle slowed the faster the two bulbs flashed. It was a brilliant bit of kit. I had one on my car and my bike.
It's decelerometer was crude by today's tech but still superior to what's used in today's lights. Ok that's not fair. Today's lights are indeed brake lights and not deceleration warning lights.
Unfortunately it didn't catch on. Once its value was established the Center High-Mounted Stop Lamp became law. This pretty much put Voevodsky out of business.
And there hasn't been another light like it that I've seen. The STS Smart Brake Light module is just like the Brake Free and similar lights. Calling their switches 'decelerometers' is generous even if technically accurate IMNSHO. They're On/Off switches for a fixed rate flashing light(s). A ball and spring.
I once thought a helmet mounted brake light was a big much. No more even though I haven't been in a rear end collision. The Brake Free seems a little gaudy to me but maybe designers thought its shape would be more eye-catching.
Were someone to make a Cyberlite-equal for helmets I'd have one in a heartbeat. No one needs to tell me what I know — that extra lights don't guarantee there will be no more rear end T/Cs. That lights flashing or otherwise don't mean a thing if a driver/rider isn't looking in their direction. We all know this. But more often than not the CHMSL and by extension a wireless brake or deceleration warning light can and do prevent T/Cs.