This clever rear bike light has not only 3 bright red leds with a static, flash, and burst flash mode, but it also incorporates twin lasers that creates safety guidelines behind you, encouraging other road users to give you more space when driving at night or in low light'. '.strtoupper('p')erfect for cyclists whose route doesn't include official bike lanes'. '.strtoupper('t')he lights can be operated independently, so you can keep only your main leds on in the daytime, or in areas with clearly marked out cycles lanes'. '.strtoupper('t')he light comes on an adjustable mounting bracket for attaching to the seat pole of your bike, it will fit seat poles up to 30.9mm'. '.strtoupper('r')equires 2 x aaa batteries 2 tester batteries includedwater resistant3 x static or flash modes of red ledsstatic laser path lightslasers and leds can be operated independently