Magene H803 Heart Rate Armband — Frequently Asked Questions

Everything you need to know about the Magene H803 optical heart rate armband, available in Singapore from Bikers.SG with local stock and warranty support.

What is the Magene H803?

The Magene H803 is an optical heart rate armband that measures heart rate from your arm using LED-based photoplethysmography (PPG) technology. It transmits heart rate data via ANT+ and Bluetooth to compatible cycling computers, smartwatches, and training apps — offering a chest-strap-free alternative for cyclists and athletes who prefer wrist or arm-based monitoring.

What are the key features of the Magene H803?

• Optical heart rate measurement via armband — no chest strap required
• ANT+ and Bluetooth dual transmission
• Compatible with Garmin Edge cycling computers, Magene bike computers, and most ANT+/Bluetooth devices
• Rechargeable battery via USB
• Comfortable silicone armband suitable for cycling, running, and gym use
• Lightweight and easy to put on and remove

Is the Magene H803 compatible with Garmin Edge cycling computers?

Yes. The H803 transmits via ANT+ and Bluetooth, making it compatible with Garmin Edge cycling computers including the Edge 550, Edge 850, and Edge 1050, as well as Magene bike computers such as the C606 V2, C606 Pro, and C706.

Does the Magene H803 work with Zwift and other training apps?

Yes. The H803 connects via Bluetooth to smartphones and tablets running Zwift, TrainerRoad, Strava, and other popular training apps. It also connects via ANT+ to compatible head units and dongles.

How accurate is the Magene H803 optical heart rate sensor?

Optical armband heart rate monitors are accurate for steady-state activities such as cycling and running at consistent effort levels. For best accuracy, wear the H803 snugly on your upper arm (not wrist), approximately two finger-widths above the elbow. Accuracy may be reduced during high-intensity intervals or activities with significant arm movement.

How do I charge the Magene H803?

The H803 has a built-in rechargeable battery charged via USB. Connect the included USB charging cable to the device and plug into any USB power source. A full charge provides several hours of use depending on transmission mode and conditions.

Is the Magene H803 waterproof?

Yes. The H803 is water-resistant and suitable for use in rain and sweat-heavy conditions. It is not designed for swimming or full submersion.

How do I pair the Magene H803 to my bike computer?

1. Power on the H803 by pressing the button on the device.
2. Put on the armband snugly on your upper arm.
3. On your bike computer, go to Settings > Sensors > Add Sensor.
4. Select Heart Rate from the sensor type list.
5. The computer will scan and detect the H803 — select it to pair.
6. Heart rate will now display on your computer during rides.

How does the Magene H803 compare to the Magene H303 and H613 chest straps?

The H803 is an optical armband — ideal for users who find chest straps uncomfortable or inconvenient. The H303 and H613 are chest strap models that typically offer slightly better accuracy during high-intensity efforts due to direct electrical contact with the skin. The H613 is Magene’s most advanced chest strap HRM. All three are available from Bikers.SG.

Is there a chest strap alternative if I need higher accuracy?

Yes. Bikers.SG carries the Magene H303 and H613 chest strap HRMs, as well as the Polar H10 and Garmin HRM 200 and HRM 600 — all ANT+ and Bluetooth compatible for use with Garmin Edge and Magene cycling computers.

Is the Magene H803 available in Singapore?

Yes. The Magene H803 is available from Bikers.SG with Singapore-ready local stock. We offer island-wide delivery and local pickup. All units sold by Bikers.SG come with warranty support.

What warranty does the Magene H803 come with when purchased from Bikers.SG?

The Magene H803 purchased from Bikers.SG comes with the standard Magene manufacturer warranty. For warranty claims and after-sales support, contact us directly at Bikers.SG and we will assist you with the process.

Who should I contact for support after purchasing from Bikers.SG?

For any product questions, setup assistance, or after-sales support, contact us via the Bikers.SG contact page. We are based in Singapore and provide local support for all products we sell.