Why can I not use RN 400 after receiving it?

Before first use, please hold the power button about 3 seconds to unlock the bike light. Otherwise the button will flash red and the light will not turn on.

What is the diameter of the handlebar that RN 400 is suitable for installation on?

RN 400 fits 28.6-35.0 mm (3 sizes of straps offered)handlebar diameter, including aero options.

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OLIGHTRN 400 LED Bike Lights, 400 Lumens USB Type-C Rechargeable Front Light, IPX7 Waterproof Bicycle Headlight for Road Urban Cyclists Black

OLIGHTRN 400 LED Bike Lights, 400 Lumens USB Type-C Rechargeable Front Light, IPX7 Waterproof Bicycle Headlight for Road Urban Cyclists Black

Product ID: 337917837

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Details

Colour
Black
Brand
OLIGHT
Material
Aluminum
Power source
Battery
Water resistance level
Waterproof

💡400 lumens max brightness

🔋Fast USB-C recharge

🌧️IPX7 waterproof rating

Description

🚴‍♂️ Light up your path, not your worries!

WEATHERPROOF WARRIOR - IPX7 waterproof design means rain or shine, your light stays reliable.
SMART BATTERY INDICATOR - Instant power status at a glance prevents unexpected outages on your commute.
CHARGE FAST RIDE LONGER - USB-C quick charging slashes downtime so you’re always ready to roll.
ILLUMINATE YOUR URBAN RIDE - 400 lumens of crisp, anti-glare light keeps you visible without blinding others.
VERSATILE MOUNTING OPTIONS - Fits helmet, handlebar, or action camera mounts for seamless integration.

The OLIGHT RN 400 is a compact, rechargeable bike headlight delivering 400 lumens of anti-glare illumination. Featuring a fast USB-C charging port, IPX7 waterproof rating, and versatile mounting options, it’s engineered for urban cyclists seeking safety, convenience, and durability in all weather conditions.

Specifications

Color	Black
Height	1.22 inches
Length	2.83 inches
Width	1.22 inches
Material Type	Aluminum
Power Source	Battery Powered
Included Components	3mm hex x 1, Handlebar mount x 1, RN 400 x 1, Silicon strap x 4, USB-C cable x 1
Batteries Included?	Yes
Brand	OLIGHT
Manufacturer	OLIGHT
Manufacturer reference	Olight-RN400
Product Dimensions	7.19 x 3.1 x 3.1 cm; 85 g
ASIN	B08MTWKV4G

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