Cateye Sync

Ok - just entered the GCN competition to win a set of these lights ...
but I have to ask myself ... why?!
Why do you need to syncronise the turning on/off of your lights? Surely you turn them on when you set off and turn them off when you finish.
All you need then is a battery level (which these do have - via an app on your phone ... ) surely using bluetooth (I assume) to connect all these devices is just going to use more battery?
Is it just another "because we can" gimick?
but I have to ask myself ... why?!
Why do you need to syncronise the turning on/off of your lights? Surely you turn them on when you set off and turn them off when you finish.
All you need then is a battery level (which these do have - via an app on your phone ... ) surely using bluetooth (I assume) to connect all these devices is just going to use more battery?
Is it just another "because we can" gimick?
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If you’ve ever turned the front light off, but forgotten to turn the rear off, then gone off for a while, then had to ride back, with no rear light, you’d see why this could be a good idea.
next...
I always have a £2 rubber clip on that i use in London for when the main one runs out of battery...
Does the job.