Water repellent.

Stainless steel shrapnel switch Can be based on different brake adjustment.

Can be installed in the V type brake and C type brake.

Use a single CR1025 battery.

Single battery time up to 50 hours.

Volume:H31mm x W16mm x (without fixing screws) L30mm

Weight: 5.5g (battery with)

Note: this brake light no switch button， only light when you brake the bike