Which type of bicycle can use this whells light?

Not only Use for Mountain bike / road bike / folding bike, 
but also jogging, walking, bicycles, car emergency, horse-riding, road emergency & camping, and so on

Is there a flashing function?
Yes, this is yes,5 LED lights beads,2 laser lights remind someone else of keeping distance, add safety

Is the battery durable? How long can you stay?
Working time: 9-36 hours depends on the batteries, Power: 2 x AAA batteries (Not included)

How many colors can I choose?

You can choose two colors for example  Red and bule

Can you turn off the switch?

Yes, that must be

Package include:  1 x Bicycle Laser Beam Rear Tail Light Lamp, 1 x Bicycle Mount  (without   batteries )