About the Flare R City USB Rear Light - 35 Lumen The Bontrager Flare R City USB Rear Light is a small yet durable tail light that keeps you seen to other road users and pedestrians. Producing an eye catching 35 Lumens, the Flare R City is visible from a far. The wide visibility angle is ideal for city use when cross junctions and round-a-bouts are common road feature. With 4 modes you are able to choose the one that best suits the weather or remaining battery you have left. Coming supplied with a quick connect bracket the light is angled with a 16 degree offset to compensate for the seat post angle. Key Features User Type: user can be seen Light Source: 1 X High powered Red LED Brightness: 35 Lumens Power Source: Rechargeable Li-Ion 250mAh 3.7 Volt. Micro USB Battery Life Indicator: Yes, has a battery save mode at 5% life Lighting Buying Guide