This is a cool and easy to use product. Attach it to any cable pulled decide and it lights up when pinched. Its Rain-proof. Uses an adjustable stainless steel leaf spring switch. Can be fixed on sidepull caliper brake or V-brake for activation while braking.

• Uses a CR1025 battery.
• Running Time: constantly 50 hours.
• Size: 31mm (h) x 16mm (w) (w/o retaining screw ) x 30mm (l).
• Weight: 5.5g (w/ battery).