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 4 Modes, up to 95 Hours

• 4 LIGHTING MODES: Constant brightness - 24h, breathing flash - 55h, strobe flashing - 80h, fast flashing - 95h. Moreover, when braking is detected, the cycle light will stay bright for 3 seconds to remind others.
• AUTO ON/OFF: On one hand, this bicycle rear 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 bike light is off, long press can adjust the brightness in three levels (low, medium, high), allowing you to choose according to the environment. And the bike light has medium brightness by default.
• MORE DETAILS: IPX6 level waterproof and dustproof, splashing water from all directions will not affect the bike tail light. There are 2 installation methods: seat post or saddle arch installation.

ROCKBROS Rear Bike Light Ultra Bright LED Bike Back Light USB Rechargeable Bicycle Taillight with 4 Lighting Modes Waterproof Cycling Light Tail light for Safety Warning Mountain Road Bikes, up to 95 Hours Brand: ROCKBROS Color: Black Charging: USB Battery: 3.7V, 400mA Weight: approx. 55g Lamp Size: approx. 40*34*34mm Material: Aluminum alloy Suitable for bicycle saddle arch with spacing of 47-54mm. 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.