The Niterider Omega 300 Rear Light can be used at night but is primarily designed as a super bright daytime running light for use through the murky winter months. Packed with 3 high-performance LEDs, the all-new Niterider Omega 300 raises the bar within the Nite Rider® line of Daylight Visible lights. The Omega 300 is designed & regulated to maximize output & runtime, boasting a hearty 6-hour runtime in its brightest Daylight Visible Flash mode setting. Daylight Visible Flash (DVF) 300 lumen super bright tail light Group Ride Mode be seen without distracting fellow cyclists Easy on & off seat post strap mount with quick release tab Convenient USB (Universal Serial Bus) rechargeable Be Seen by cars = Be Safe FL1 Standard IP64, dust & water-resistant Lumen Output:300 Run Time:5:30 30:00hrs Charge Time:4:00hrs Weight:82g Battery: Li-Po