Run times will vary depending on whether you are running the light as a front (white), or rear (red) but we’ll get on to that later. Can’t wait that long, ok- noticeably longer in the white setting. Switching between white and red is simply a matter of holding the sensibly positive (and in my view, well positioned) power cum mode switch down for 2 seconds. Change modes by single presses until you reach the desired output and beam pattern.

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The light’s memory function extends to this, so you can just hop and scoot off following a day at work, or mid-ride cafe stop. Thoughtfully there’s a locking function to prevent accidental power ups, say when it’s bouncing around in the bottom of a pannier, or holidaying in a pocket. I’ve accidentally set this a couple of times but a sustained 3 second press has always brought it back on. Became very intuitive within three attempts, even on dark mornings. A simple, but generally effective battery life/charge indicator reads green, constant red and flashing red. Green is 100%-21%, red 20-11% and flashing red means you’re down to 10%. Good to know but, its good practice to charge batteries regularly (a) to prevent unexpected and inconvenient outages (b) ensuring lithium-polymer cells don’t fall below 70% charge extends their working life by some margin.

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As for the syncing function, this is automatic and occurs when two (or more) units come within close range and are flashing- they'll produce the same output in unison, rather than competing. Theoretically making you easier to spot.