Newbie here, I designed a product and need testers

What I'm thinking is the wrist band won't be able to tell the difference between these 2.

@Clockwise that is the inherent fault with this units, you are unable to use these handle bars. So again these units are not for everyone. If these used a digital switch maybe you could over come this problem. If there was enough interest I would seriously think about producing a digitally activated model.

It's simple, just make it at least 90 degree or higher.

When you signal, as pre bikeability, you should do it assertively, rather than half arsed.

People who want to use those are likely to use them for commuting, rather than time trial, road racing, and the like where they're very unlikely to bend their arm enough to get it 90 degree horizontally (like on aerobar).

This is the only thing I like about this idea, is that it encourage people to signal properly, as oppose to just flicking your wrist for a few second.

Why would you ride more assertively if you already feel visible?

If I felt unsafe, surely I would ride in a less confident way? Maybe we should just agree to disagree on this one :)

Point being, if you feel more visible due to the wearing of such garment, then what's the point of venturing into primary position in the first place if you feel that you're visible enough to be seen by other road users?

I'm sorry you've lost me. I just think a wide choice / range of safety equipment and lights is a good thing, so everyone can choose what makes them feel safe.

It can be a good thing, but the reliance on it in order to feel safe, rather than adapting how you ride/changing the law to punish poor driving isn't.

These units are not fully water proof, but if you break them its okay. should I have different wrist sizes? is this more hassle then they are worth? do they properly activate? Would a jacket with indicators fit in be more effective?

Also when the arms are completely dropped and resting by your side, because of the analogue method chosen to activate the lights these units will flash. Is this going to be a serious issue?

If I were to choose a digital method of light activation, the cost would be nearer £30 for a set of wrist bands, would you still buy them?

My logic was, make them as cheap as possible

Waterproof is essential for final product, it's a very common and annoying failure of lights.

If they are likely to flash when not in use, why not just have them constant, with a simple on / off switch? Surely a tiny LED will only use a small amount of power, and this would be simpler / cheaper?

Is a switch what you mean by "digital method"? Surprised it would cost so much more.

As I said, my mate bought two tiny lights with elastic loops which strap round his hands. They cost about £5.

This is what it's all about!

http://youtu.be/1MFuSMz1zh0

Not a silly helmet in sight either :)