Rockbros HRM812 Heart Rate Monitor Chest Strap Bluetooth ANT+ IP67 Black

Clip the lightweight sensor onto the adjustable chest strap and pair it with your bike computer or fitness app before heading out for a ride. The Rockbros HRM812 tracks your pulse in real time, so you can train in the right zone and see your effort on the screen.

Key specifications

• Connectivity: Bluetooth 4.0 and ANT+ for broad device compatibility
• Water resistance: IP67 (protected against dust and temporary immersion)
• Heart rate range: 30–240 bpm
• Battery: CR2032 coin cell, up to 1000 hours of use
• Strap material: Nylon and spandex, adjustable for a secure fit
• Sensor dimensions: 61.9 x 34.3 x 10 mm; sensor weight approx. 13 g (45 g with strap)
• Operating temperature: -10°C to 50°C

Why choose it

Dual Bluetooth and ANT+ transmission means the HRM812 works with most GPS watches, cycling computers, and popular apps like Zwift, Strava, and Garmin Connect. The soft strap stays comfortable during long sessions, and the IP67 rating lets you train in rain or sweat without worry. A simple LED confirms the sensor is active.

Ideal use cases

• Road cycling, mountain biking, and indoor training with real-time heart rate data
• Running and triathlon workouts where a chest strap gives more accurate readings than wrist sensors
• Everyday fitness tracking with a smartphone or compatible smartwatch

Good to know

The sensor snaps onto the strap and is easy to remove for washing. Replace the CR2032 battery by opening the back cover—no tools needed. The strap length adjusts from about 65 to 95 cm to fit most chest sizes.