In the Box
- SEEMEE R300 Taillight
- Seat post mount
- MJ-6556 Saddle mount (sold separately)
- USB-C charging cable
Important Warnings
⚠️ WARNING!
- To prevent inadvertent switching on, keep the light unit in lockout mode before transport or storage.
- DO NOT disassemble, modify, remanufacture, puncture, or damage the device or batteries.
- The SEEMEE R300 radar taillight does not replace cyclist attentiveness and good judgment. Always operate the bicycle in a safe manner. Failure to do so could result in severe injury or death.
Start Guide
The SEEMEE R300 connects to bike computers via the radar ANT+ protocol, supporting both Lights ANT+ and Radar ANT+ protocols.
- Detects approaching vehicles up to 140 meters away.
- Detects vehicle speed from 10 to 160 km/h (6 to 99 mph).
- Note: Does not detect vehicles traveling at the same speed as your bike.
- Radar detection angle: 35° horizontally and 45° vertically.
- Can detect up to eight approaching vehicles.
Pair with a Bike Computer
Note: Place your bike computer and taillight within 3 meters. Keep 10 meters away from other ANT+ sensors when pairing.
- Turn on SEEMEE R300 and activate its radar function.
- On your bike computer, navigate to Menu > Sensors > Add Sensors > Radar > Search All.
- Select SEEMEE R300 (identified by a random number) and click "Add".
- Upon successful pairing, the sensor will indicate that "Radar" and "Lights" are connected.
Operation Instructions
ON/OFF
Press and hold the power button for 1 second to turn the taillight on/off. The radar function is activated by default when the taillight is on.
RADAR FUNCTION ON/OFF
- Press and hold the radar button for 1 second to turn the radar function on/off.
- The radar function can be controlled independently. When only the radar is on, the taillight operates in radar-only mode.
RADAR INDICATOR
- When the radar is working, the indicator circles clockwise with a red light.
- When the radar is abnormal, the indicator flashes white.
CHANGE MODE
When the taillight is on, click the power button to cycle through modes: Low → High → Night Flash → Day Flash → Eco Flash → Low...
Bike Computer Control
With a connected bike computer, enter "Light Mode" to select brightness or customize lighting modes, such as automatic adjustment based on ambient light.
Memory Function
When the taillight is turned on again, it automatically reverts to the last selected lighting mode.
Vibration Function ON
When the taillight is off, press and hold the power button and radar button for 3 seconds until the taillight lights up constantly at maximum output. The vibration function enters sleep mode after 5 minutes of inactivity and automatically activates when vibration is detected. When vibrations are detected, the taillight turns on and illuminates with the last selected lighting mode.
Vibration Function OFF
When the taillight is off, press and hold the power button and radar button for 3 seconds until the taillight flashes quickly at maximum output.
Lockout/Unlock
- Lockout: Press and hold the power button for 3 seconds to enter lockout mode, temporarily deactivating all other functions. The indicator will flash red when a button is pressed.
- Unlock: In lockout mode, press and hold the power button for 3 seconds to unlock the taillight.
Output / Runtime
| Mode | Lumens | Radar ON | Radar OFF |
|---|---|---|---|
| Low | 15LM | 14.5h | 32.7h |
| High | 50LM | 8h | 19.5h |
| Night Flash | 10-50LM | 11.9h | 26.5h |
| Day Flash | 0-100LM | 16.2h | 38.4h |
| Eco Flash | 0-3-3-10LM | 24h | 100h |
| Group Ride Mode | 5LM | 20.1h | 54h |
| Only Radar Mode | 1LM | 26.3h | / |
*Taillight modes are subject to the identification display of the bike computer's Light Mode control interface. Differences may occur based on computer brands.
Radar Flash Mode
| Radar Flash Mode | Lumens | Mode |
|---|---|---|
| Radar Night Flash | 0-60LM | Eco Flash, Low, Night Flash |
| Radar Day Flash | 0-300LM | High, Day Flash |
| Radar Flash Off | 0LM | Group Ride |
| Only Radar Mode | 0-300LM | Light up in the last selected radar flash mode |
*All data measured in accordance with ANSI/NEMA FL 1-2009. Tests conducted at 25°C and 25 km/h wind speed. Runtime may vary with external temperature and ventilation.
Special Modes
Group Ride Mode
When two or more SEEMEE R300 units are simultaneously in Low mode and within 10 meters, they automatically switch to Group Ride mode.
PelotonSync Flash Mode
When two or more SEEMEE R300 taillights are close and flash in the same pattern, they automatically switch to PelotonSync Flash mode. Press the button to exit and switch to other modes.
Low Power Mode
When battery power drops below 10%, the taillight switches to Eco Flash mode and cannot be adjusted. Radar flash and vibration functions are disabled during this period.
*Runtime for "Only Radar Mode" is for reference only.
*In Group Ride mode, the radar flash is off, and the taillight provides only computer radar data.
View Radar on Your Bike Computer
During a ride, radar information is displayed on the activity data screen. Vehicle position is shown on a column that moves up as a vehicle approaches. The threat level is indicated by color: Green (no vehicle detected), Orange (vehicle approaching), Red (vehicle approaching at high speed).
If your bike computer is set to sound or vibrate, it will alert you to the first detected vehicle. After the threat is cleared and a new vehicle approaches, another alert will sound.
Customize Radar Alert Settings
- On your bike computer, select Menu > Sensors > Radar (corresponding number) > Sensor Details > Alert Settings.
- Select your preferred option.
Charging / Battery Indicator
When the taillight is off, click the power button to display the remaining battery level for 3 seconds.
- Charging: Flashing red light.
- Fully charged: Constant green light for 2 minutes.
- Standard charging time: Approximately 2.15 hours (5V 2A).
Battery Indicator Status
- 100%-40%: Constant green.
- 39%-11%: Constant red.
- 10%-0%: Flashing red.
When connected to your bike computer, check the taillight's remaining power on the computer. The computer will indicate low battery or low power mode.
How to Install
1. Install on Seat Post
Step 1: Attach the seat post mount to the seat post.
Step 2: Slide the SEEMEE R300 taillight onto the mount.
Step 3: Secure the taillight to the mount.
Step 4: Ensure the taillight is firmly attached.
2. Install Under Saddle (Optional)
Follow the provided diagrams to attach the taillight using the saddle mount.
Installation Guidance
Correct Installation: The taillight should be mounted vertically, perpendicular to the ground (90° angle). ✔️
Incorrect Installation: Mounting horizontally or with the beam obstructed is not recommended. ❌
Incorrect Installation: Mounting upside down is not recommended. ❌
FCC Statement
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body.
