Originally Posted by
PaulRivers
Thanks, but that's how I found the light and it's pretty ambigous -
"The Busch&Müller 4DToplight Senso Multi can be powered by batteries or any 6 volt dynamo. Two LEDs in the center, and an LED on each side make for increased visibility. A three position switch allows automatic switching from battery power to dynamo power when you start and stop. And is case of a wire failure, the batteries will keep your taillight "on". The bike must be moving for the Senso function to turn on the lights. So they won't switch on while your bike is parked overnight. Wiring not included. $ 41.50 ".
From what I understand from B&M's labelling
Plus = Standlicht = Standlight (stays on for some period of time when wheels stop spinning but doesn't stay on permanent)
It appears, you really wanted was the Busch&Müller DToplight XS Plus
What you have automatically switches to battery if the bike stops, which is slightly different.