Sena C1 Smart Cycling Helmet User Manual

1. Product Overview

The Sena C1 Smart Cycling Helmet integrates advanced communication technology with essential cycling safety features. Designed for comfort and connectivity, it allows riders to communicate, listen to music, and stay aware of their surroundings.

Figure 1: Sena C1 Smart Cycling Helmet (Matte Gray)

Key Features:

• 4-Way Bluetooth Intercom: Full-duplex communication for up to four helmets.
• Integrated Speakers & Microphone: Built-in audio system for clear communication and media.
• Integrated Taillight: Enhances rider visibility with multiple brightness settings.
• Smartphone Connectivity: Stream music, receive GPS directions, and manage calls.
• Sena Cycling App Compatibility: Adjust settings and manage features via a mobile app.

Figure 2: Overview of Sena C1 Smart Cycling Helmet features.

Product Video: C1 Smart Cycling Helmet Tech Talk

Video 1: A detailed technical overview of the Sena C1 Smart Cycling Helmet, highlighting its integrated features and benefits.

2. Setup and Fit

Proper fit is crucial for both comfort and safety. Follow these steps to ensure your Sena C1 helmet fits correctly.

2.1. Measuring Your Head

1. Measure Circumference: Use a flexible tape measure to find the circumference of your head. Position the tape roughly 1 inch (2.5 cm) above your eyebrows and at the top of your ears.
2. Snug Fit: Pull the tape measure snugly, ensuring it is level from front to back.
3. Record Measurement: Note the number where the tape measure overlaps.
4. Compare to Sizing Chart: Refer to the sizing chart below to determine your recommended helmet size.

Figure 3: Measuring head circumference for proper helmet sizing.

Sizing Guide:

2.2. Adjusting the Helmet

1. Open Dial Adjustment: Before placing the helmet on your head, open the dial adjustment at the back to its widest setting. This ensures the helmet shell can fit down properly.
2. Position Helmet: Place the helmet on your head. It should feel snug but comfortable, sitting level (not too far forward or back).
3. Tighten Dial: Slowly tighten the dial adjustment at the back until the helmet feels secure. It should not be overly tight, just enough to prevent excessive movement.
4. Buckle Chin Strap: Fasten the chin strap. Ensure it is loose enough to allow you to move your mouth, but tight enough that you can only fit about three fingers between your chin and the strap.
5. Adjust Side Straps: Adjust the buckles on the side straps so they lie flat against your head and around your ears. The straps should not touch your ears for maximum comfort. You may need to re-adjust the chin strap after positioning the side buckles.

Figure 4: Adjusting the helmet's rear dial for a secure fit.

Figure 5: Ensuring proper chin strap tension.

2.3. Checking the Fit

Once adjusted, perform these checks to confirm a secure fit:

• Shake Head: Shake your head side-to-side and front-to-back. The helmet should remain in place and not slip.
• Pressure Check: If you feel excessive pressure, slightly loosen the dial adjustment. Ensure it's not so loose that the helmet shifts when you move your head.

Product Video: Sena Cycling Helmet Size Guide

Video 2: A comprehensive guide on how to measure your head and properly fit a Sena cycling helmet for optimal safety and comfort.

3. Operating Instructions

3.1. Power On/Off

• Power On: Press and hold the Plus (+) button and the Center button for 1 second.
• Power Off: Press and hold the Center button for 5 seconds.

3.2. Charging the Helmet

To charge your C1 helmet:

1. Locate the USB-C charging port at the rear of the helmet, usually covered by a rubber flap.
2. Open the rubber flap and insert the provided USB-C cable (or any compatible USB-C cable).
3. Connect the other end of the cable to a USB power source.

A full charge takes approximately 2.5 hours. Talk time ranges from 6-10 hours, depending on LED use.

Figure 6: Built-in speakers and microphone for clear audio.

3.3. Smartphone Connectivity (Bluetooth Pairing)

To pair your C1 helmet with your smartphone:

1. Turn on your C1 helmet. It will automatically enter "Phone Pairing" mode the first time it's turned on.
2. On your smartphone, go to Settings > Bluetooth.
3. Select "Sena C1" from the list of available devices.
4. Once paired, your helmet will automatically connect to your phone whenever it's within range and powered on.

Figure 7: Seamless smartphone connectivity for calls, music, and GPS.

3.4. 4-Way Bluetooth Intercom

The C1 helmet supports intercom communication with up to three other Sena C1 helmets (total of 4 riders) within a range of up to 300 meters (980 feet).

1. Intercom Pairing: With both helmets powered on, press and hold the Center button on both helmets until you hear "Intercom Pairing". The helmets will automatically seek and pair with each other.
2. Start Intercom: Once paired, one rider taps the Center button once to initiate intercom conversation.
3. End Intercom: Tap the Center button again to end the intercom conversation.

Figure 8: Rider-to-rider communication for enhanced group rides.

3.5. Integrated Taillight

The integrated taillight improves visibility for other road users.

• Activate Taillight: Tap the Plus (+) and Minus (-) buttons simultaneously once to turn on the taillight (Solid mode).
• Change Mode: Tap the Plus (+) and Minus (-) buttons simultaneously again to cycle through modes: Night Flash, Day Flash.
• Turn Off: Tap the Plus (+) and Minus (-) buttons simultaneously a fourth time to turn off the taillight.

Figure 9: Taillight modes for various visibility needs.

3.6. Volume Control

• Increase Volume: Press the Plus (+) button.
• Decrease Volume: Press the Minus (-) button.

3.7. Sena Cycling App

The Sena Cycling App (available for iOS and Android) allows you to configure settings, manage intercom connections, and control the taillight directly from your smartphone.

Figure 10: Manage helmet settings with the Sena Cycling App.

4. Maintenance

• Cleaning: Clean the helmet exterior with a soft, damp cloth and mild soap. Avoid harsh chemicals or abrasive cleaners.
• Interior Pads: Removable interior pads can be hand-washed with mild soap and water, then air-dried.
• Storage: Store the helmet in a cool, dry place away from direct sunlight and extreme temperatures. Use the provided helmet pouch for protection.
• Charging Port: Ensure the USB-C charging port is clean and dry before charging. Keep the rubber flap closed when not charging to prevent dust and moisture ingress.
• Firmware Updates: Periodically check the Sena website or Sena Cycling App for firmware updates to ensure optimal performance and access to new features.

5. Troubleshooting

5.1. No Power / Not Turning On

• Ensure the battery is charged. Connect to a power source and check if the charging indicator light appears.
• Try a different USB-C cable and power adapter.
• Perform a factory reset (refer to the full user manual for specific instructions).

5.2. Bluetooth Pairing Issues

• Ensure the helmet is in pairing mode.
• Delete previous Bluetooth connections on your smartphone and helmet.
• Move closer to your device and ensure no other Bluetooth devices are interfering.

5.3. Intercom Not Connecting

• Ensure both helmets are in intercom pairing mode simultaneously.
• Check the distance between helmets; maximum range is 300 meters.
• Ensure no obstacles are severely blocking the signal.

5.4. Audio Quality Issues (Static, Low Volume)

• Adjust the volume using the Plus (+) and Minus (-) buttons.
• Ensure the speakers are positioned correctly near your ears.
• Check for firmware updates, as these often include audio improvements.

6. Specifications

7. Warranty & Support

7.1. Warranty Information

Sena provides the following warranty for the C1 Smart Cycling Helmet:

• Electronics: 2 years
• Helmet Integrity: 2 years

Please retain your proof of purchase for warranty claims. The warranty covers defects in materials and workmanship under normal use.

7.2. Customer Support

For further assistance, technical support, or warranty claims, please contact Sena customer service through their official website or refer to the full user manual (PDF) available online:

Download Full User Manual (PDF)

Visit the Sena Store