Heart rate sensor Magene H303 — wireless chest strap heart-rate monitor

Magene H303 — wireless chest strap heart-rate monitor designed to deliver continuous, accurate heart rate data during workouts and everyday activities. The H303 uses an ECG signal processing chip and a proprietary algorithm to extract heart rate directly from the ECG waveform, reducing interference from movement and sweat. Lightweight and ergonomically shaped, the unit includes an adjustable elastic chest strap, preinstalled CR2032 battery and supports simultaneous Bluetooth 4.2 and ANT+ connections for real-time data transfer to cycling computers, sports watches and mobile apps.

Advantages

The Magene H303 provides high-precision heart rate measurement with ±1 BPM accuracy across a 30–240 BPM range while remaining comfortable to wear thanks to a slim sensor (62.3 x 35.1 x 11.5 mm) and an adjustable strap. Dual-protocol connectivity (Bluetooth 4.2 and ANT+) allows it to pair with two devices at once, and the long-lasting CR2032 battery offers up to 1000 hours of operation. IP67 water resistance ensures reliable performance in wet conditions and during intense training sessions.

Suitable for

• Runners tracking pace and training zones
• Cyclists using bike computers or training apps
• Gym users monitoring heart-rate zones during workouts
• Fitness enthusiasts integrating data with apps like Zwift, Strava or Wahoo
• Users needing a lightweight, durable chest-strap monitor for outdoor training

Key specifications

• Dimensions: 62.3 x 35.1 x 11.5 mm (sensor)
• Chest strap length: 64–86 cm (±2 cm), adjustable elastic strap
• Weight: 16 g (sensor), 30±1 g (strap)
• Connectivity: Bluetooth 4.2 and ANT+ (simultaneous pairing supported)
• Heart rate measurement range: 30–240 BPM
• Heart rate accuracy: ±1 BPM
• Battery type and life: CR2032, up to 1000 hours
• Ingress protection: IP67 (dust resistant, immersion up to 1 m for 30 min)

How to use

Attach the adjustable elastic strap around the chest so the sensor sits flat against the skin below the sternum. Turn on the receiving device or app, enable Bluetooth or ANT+ and pair with the Magene H303; the sensor can connect to two devices simultaneously. Ensure good skin contact and dampen the contact pads slightly if necessary to improve signal quality. After use, remove the strap, wipe the sensor dry and store in a cool, dry place. Replace the CR2032 battery when the paired device indicates low battery.

Usage recommendations

For best measurement stability, position the sensor centrally under the breastbone and adjust the strap for a snug but comfortable fit. Use the H303 with compatible apps or devices that display BPM and training zones. Rinse and air-dry the strap after heavy sweating and avoid exposing the sensor to strong chemicals or prolonged direct sunlight to preserve seals and electronics.