See and be seen, that's an old saying. STR1 Strobe ensures that last part. It was designed to improve safety conditions at dawn or reduced visibility environments. Visible up to 10Km. Rugged construction ensures long life. Technical Details: Power: ~100W (peak) Supply Voltage: 12VDC Colors available: White, green and red Dimensions: 73 mm (height), 58 mm (diameter) Flashes per minute: 42 (Factory programmable) Undervoltage and Overvoltage protection. Overheating protection.