Introduction
Thank you for choosing the Gaciron CETUS-1700 Smart Bicycle Front Light. This advanced headlight is designed to enhance your cycling safety and experience with its powerful illumination, smart features, and durable construction. Please read this manual carefully before use to ensure proper operation and maintenance.

Gaciron CETUS-1700 Smart Bicycle Front Light
Product Features
- Aerodynamic Design: Reduces wind resistance by more than half compared to traditional bike lights, equivalent to reducing 500g of weight during riding.
- Optimized for Underneath Mounting: Secure and reliable with a one-second quick-release mechanism.
- Smart Auto ON/OFF: Goes to sleep mode after 2 minutes of stillness and instantly lights up when motion is detected.
- Wireless Remote Control: Adjust between 6 brightness modes without taking your hands off the bars for a safer ride.
- Precise Cut-off Low Beam & Clear High Beam Visibility: Ultra-wide 30m light spread ensures no blind spots, even on sharp turns, for a safer, easier night ride. Anti-glare design with a clear cut-off line.
- 1700 Lumens with Six Lighting Modes: Different modes to suit various road conditions.
- IPX6 Waterproof: Built to withstand heavy rain and high-pressure water jets.
- Type-C Fast Charging: 5V/2A input, full charge in only 2 hours.
- Built-in Large-Capacity Battery: 4200mAh (3*1400mAh) for maximum 24 hours runtime (Breathe Mode).
- Temperature Control Protection: Activates when temperature is higher than 90°C or lower than -20°C, locking to low-beam low-brightness gear (200LM) and flashing the battery indicator.
- Lock Function / Power Indicator: Prevents accidental activation during transport.
- Ultra-Wide Lighting Effect: Visual range width reaches up to 30 meters, ensuring daylight-clear vision for night cycling.
Video: Gaciron CETUS-1700 Aerodynamic Smart Bicycle Light demonstration, showing features like mounting, smart auto ON/OFF, wireless remote, low/high beam, lighting modes, waterproofing, and charging.
Packing List
Please check the package contents to ensure all items are present:

Image: Contents of the Gaciron CETUS-1700 package.
- CETUS-1700 Bicycle Front Light
- Wireless Remote Control
- H17 Bracket (for round handlebars)
- Screw
- Medium-sized Screw Rod
- Nut
- Wrench
- GoPro Adapter
Note: The H17 bracket is designed for round handlebars with a diameter between 25.8mm and 31.8mm. If your bicycle handlebar falls outside this range, you may need to purchase an additional Gaciron H11 or H25 bracket (if available).
Setup
1. Mounting the Light
- Attach the H17 bracket to your bicycle's handlebar using the provided screws and wrench. Ensure it is securely fastened.
- Align the CETUS-1700 light with the bracket's buckle.
- Fully insert the product into the buckle until you hear a 'click'. This indicates that the installation is complete and secure.

Image: Step-by-step guide for installing the CETUS-1700 light onto the H17 bracket.
2. Wireless Remote Control Pairing
To pair the wireless remote control with your CETUS-1700 light:
- Within the first 10 seconds of entering Breathing Mode on the light, long-press the remote control button for 1 second.
- After successful pairing, the light will automatically switch to Low Brightness Mode.

Image: Wireless remote control for one-key switching of light modes.
Operating Instructions
1. Power ON/OFF and Mode Selection
- Smart Auto ON/OFF: The light intelligently detects riding status. It automatically enters sleep mode after 2 minutes of stationary parking and instantly lights up when vibration from pushing the bike is detected.
- Wireless Remote Control: Use the remote to easily switch between the 6 light brightness levels without taking your hands off the handlebars.
- Intelligent Vibration ON/OFF: When the light is turned on and switched to Daytime Flash mode, long-press the button on the light for 5 seconds to disable or enable the vibration switch. Upon successful operation (on/off), the bike light will enter Low Beam Constant On mode.

Image: Intelligent Start-Stop feature for seamless operation.
2. Lighting Modes and Runtimes
The CETUS-1700 offers six distinct lighting modes:

Image: Visual representation of the 6 lighting modes and their approximate runtimes.
- High Beam & Low Beam: 1700LM, Runtime ≈ 2h
- High & Low Beam: 900LM, Runtime ≈ 3.5h
- Low Beam: 600LM, Runtime ≈ 4h
- Low Beam Constant: 300LM, Runtime ≈ 7h
- Breathe Flash: 50-100LM, Runtime ≈ 20h
- Daytime Flash: 600LM, Runtime ≈ 24h
Note: Actual measurements may vary slightly under different environmental conditions.
3. Lock Function
The lock function is suitable for long-term transportation to prevent accidental activation.
- To Lock: Long-press the button on the light for 5 seconds to enter the locked state. In the locked state, single-click the button, and the battery indicator will flash quickly 3 times.
- To Unlock: Complete 5 single-clicks within 3 seconds to unlock the product. Unlocking is required for first use.
4. Power Indicator
The battery indicator provides real-time battery level information:
- When powered on:
- Red flashing: 1-20% battery
- Yellow light steady: 21-60% battery
- Blue light steady: 61-100% battery
- When powered off: Single-click (short press) the button; the battery indicator light turns on for 5 seconds and then turns off.

Image: Details on the lock function and battery level display.
Charging
The CETUS-1700 features Type-C fast charging.
- Input: 5V/2A
- Charge Time: Approximately 2 hours for a full charge.
- Charging Indicator:
- Red flashing: During charging
- Blue light steady: Fully charged
- Protection: Automatic power-off when fully charged to prevent overcharging and effectively protect battery life.

Image: Type-C charging port and charging indicators.
Maintenance
- Cleaning: Wipe the light with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Waterproof: The light is IPX6 waterproof, meaning it is resistant to heavy rain and powerful water jets. However, avoid submerging it in water.
- Storage: Store the light in a cool, dry place when not in use. If storing for an extended period, charge the battery periodically to maintain its health.
- Temperature Protection: The built-in temperature control system protects the light and extends its lifespan by adjusting brightness in extreme temperatures (above 90°C or below -20°C).

Image: Gaciron CETUS-1700 demonstrating IPX6 waterproof rating.

Image: Diagram illustrating the temperature control protection mechanism.
Troubleshooting
- Light not turning on: Ensure the battery is charged. Unlock the device if it's in the locked state (5 quick clicks).
- Remote control not working: Ensure the remote is paired correctly (refer to 'Wireless Remote Control Pairing' in the Setup section). Check the remote's battery if applicable.
- Light unexpectedly changes brightness or turns off in extreme conditions: This is likely the temperature control protection activating. The light will return to normal operation once the temperature stabilizes.
- Short battery life: Ensure the light is fully charged. Battery performance can be affected by extreme temperatures or prolonged use in high-brightness modes.
Specifications

Image: Detailed specifications of the Gaciron CETUS-1700.
| Attribute | Value |
|---|---|
| Name | CETUS-1700 |
| Max Brightness | 1700 Lumens |
| Battery Capacity | 4200mAh (3*1400mAh) |
| Optics | Cutoff Line/High & Low Beams |
| Charge Method | Type-C |
| Max Runtime | About 24h (Breathe Mode) |
| Charge Time | About 2h |
| Waterproof Level | IPX6 |
| Weight | About 181g |
| Material | Aluminum Alloy/Nylon |
| Irradiation Distance | >200m |
| Color Options | Black/Black & White/Pink & White |
| Intelligent Sensing | Yes |
| Support Dimmer | 5 - 8 Files |
User Tips
- Always ensure your light is fully charged before long rides, especially at night.
- Familiarize yourself with the wireless remote control to quickly switch modes without distraction.
- Utilize the anti-glare cutoff line feature to avoid blinding oncoming traffic while maintaining clear visibility for yourself.
- Consider the 'Daytime Flash' mode for enhanced visibility during daylight hours, maximizing battery life.
Warranty and Support
For warranty information and customer support, please refer to the official Gaciron website or contact your retailer. Keep your purchase receipt as proof of purchase.





