1. Introduction
This manual provides detailed instructions for the G Keni Smart Brake Sensing Rear Bike Light, Model Q5. Designed for enhanced cycling safety, this ultra-bright LED taillight features smart brake sensing, auto light sensing, and a durable aluminum alloy shell with IPX6 waterproofing. Please read this manual thoroughly before use to ensure proper operation and maintenance.
2. Product Features
- Smart Brake Sensing: Automatically switches to high brightness for 5 seconds upon braking, alerting rear riders.
- Four Light Modes: Normal Flash, Breathing Flash, Fast Flash, and Steady On modes for various riding conditions.
- Auto Light Sensing: Automatically turns on in darkness and off in daylight (applicable to Normal Flash and Breathing Flash modes).
- Motion Sensing: Auto-off after 30 seconds of no motion, and auto-on when motion is detected.
- Adjustable Brightness: Max 120 Lumen, adjustable in Steady On mode by long-pressing the button.
- Long Battery Life: Built-in 400mAh Li-ion battery, offering up to 50 hours of runtime depending on settings.
- Durable Construction: Aluminum alloy shell with IPX6 waterproof and dustproof rating.
- USB Rechargeable: Convenient charging via USB port.
Figure 2.1: Key Features Overview
3. Package Contents
Please verify that all items are present in your package:
- G Keni Smart Brake Sensing Rear Bike Light (1 unit)
- Metal Mounting Bracket (for saddle mounting)
- Adjustable Silicone Strap (for seat post mounting)
- USB Charging Cable
- User Manual (this document)
4. Setup
4.1 Charging the Battery
Before first use, fully charge the bike light. The device features a built-in 400mAh Li-ion battery.
- Locate the USB charging port on the light.
- Connect the provided USB charging cable to the light and to a standard USB power source (e.g., computer USB port, wall adapter).
- The four blue indicator lights will show charging progress, each representing 25% capacity. All four lights will be solid when fully charged.
Figure 4.1: USB Charging Port Location
4.2 Mounting the Light
The G Keni bike light offers two primary mounting options:
- Under the Saddle (with Metal Mounting Bracket):
- Attach the metal bracket to the saddle rails using the provided hardware.
- Slide the bike light onto the bracket until it securely clicks into place.
- To the Seat Post (with Adjustable Silicone Strap):
- Secure the silicone strap mount to your bike's seat post.
- Attach the bike light to the silicone strap mount. Ensure it is firmly attached and facing rearward.
Figure 4.2: Mounting Options
5. Operating Instructions
5.1 Power On/Off
Press and hold the power button located on the light to turn it on or off.
5.2 Changing Light Modes
Once powered on, short press the power button to cycle through the four available light modes:
- Normal Flash Mode
- Breathing Flash Mode
- Fast Flash Mode
- Steady On Mode
Figure 5.1: Light Modes and Battery Life
5.3 Smart Features
- Brake Sensing: The light automatically brightens to ultra-bright mode for 5 seconds when braking is detected.
- Light Sensing (Auto ON/OFF): In Normal Flash and Breathing Flash modes, the light will automatically turn off in bright conditions (daylight) and turn on in dark conditions. If you require the taillight to remain on during daytime, select Fast Flash or Steady On mode.
- Motion Sensing (Auto ON/OFF): The light will automatically turn off after 30 seconds of no motion. It will automatically turn back on when motion is detected.
- Adjusting Brightness (Steady On Mode): While in Steady On mode, long press the power button to adjust the brightness level.
Figure 5.2: Smart Sensing Functions
6. Maintenance
- Cleaning: Wipe the light with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Charging: Recharge the battery regularly, especially if the light will not be used for an extended period, to maintain battery health.
- Storage: Store the light in a cool, dry place when not in use.
- Water Resistance: While IPX6 waterproof, avoid prolonged submersion in water. Ensure the USB port cover is securely closed to maintain water resistance.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Light does not turn on. | Battery is depleted. | Charge the light using the provided USB cable. |
| Light turns off unexpectedly. | Motion sensor activated auto-off. | Move the bike or tap the light to reactivate. |
| Light does not turn on in daylight. | Light sensing feature is active (Normal Flash/Breathing Flash modes). | Switch to Fast Flash or Steady On mode if daytime visibility is desired. |
| Brake sensing not working. | Light not securely mounted or sensor obstructed. | Ensure light is firmly mounted and sensor area is clear. |
8. Specifications
| Attribute | Detail |
|---|---|
| Brand | G Keni |
| Model Name | Q5 |
| Color | Red |
| Material | Aluminum, Plastic |
| Power Source | Battery Powered |
| Battery Capacity | 400mAh Li-ion (Built-in) |
| Water Resistance Level | IPX6 |
| Item Weight | 3 Ounces |
| Product Dimensions | 1.57"L x 1.34"W x 1.34"H |
| Number of Settings | 4 Light Modes |
| Brightness | Max 120 Lumen |
| Mounting Type | Seat Mount (Saddle or Seat Post) |
9. Warranty and Support
G Keni provides a 12-month warranty for this product from the date of purchase. We also offer a 30-day money-back guarantee. For any questions, concerns, or support needs, please contact our customer service team, available 24/7. Your satisfaction is our priority.
Contact information for support can typically be found on the product packaging or the official G Keni website.
