ROCKBROS Bike Tail Light Rear Light USB Rechargeable Bicycle Taillight Waterproof LED Bike Back Ultra Bright Smart Cycling for Safety Warning MTB Road Bikes with 5 Modes, Up To 65 Hours

• 5 LIGHTING MODES: Red flash - 65h, red quick flash - 40h, breathing flash (3 colors) - 35h, red, blue and purple quick flash - 35h, constant brightness - 15h. Battery life ranges from 15 to 65 hours, depending on the mode selected.
• AUTO ON/OFF: On one hand, this smart bike light intelligently turns off or turns on depending on the light intensity. One the other hand, the rear light turns off automatically after 30 seconds of immobilization of the bike and turns on automatically in the event of vibration.
• SAME FREQUENCY MODE: Double-click the button to switch to this mode. when teammates equipped with the same bike taillight and ride near each other, The taillights will automatically change to maintain the same flashing pattern and frequency.
• THREE ADJUSTABLE BRIGHTNESS: When the bicycle rear light turns off, long press can adjust the brightness in three levels (low, medium, high), allowing you to choose according to the environment. And the has medium brightness by default.
• MORE DETAILS: IPX6 level waterproof and dustproof, splashing water from all directions will not affect the bicycle light. There are 2 installation methods: seat post or saddle arch installation.

ROCKBROS Rear Bike Light USB Rechargeable Bicycle Taillight Ultra Bright Bike Back Light LED Smart Bike Light with 4 Modes Waterproof Tail Light Cycling Light for Safety, Warning, MTB, All Bikes Brand: ROCKBROS Color: Black Charging: USB Battery: 3.7V, 300mA Material: Aluminum alloy + Plastic Weight: approx. 33g Lamp Size: approx. 30*34*34mm Suitable for bicycle saddle arch with spacing of 38-54mm. ROCKBROS promises to offer 100% satisfaction to every buyer. If you encounter any problems or have any questions for us, please do not hesitate to write to us through Amazon. We will offer you the best possible solution.