GEOID HS800 Optical Armband Heart Rate Monitor

Accurate Real-Time Heart Rate Monitoring for Fitness & Cycling

The HS800 uses advanced photoelectric dual-beam technology to detect heart rate with ±1 BPM accuracy across a 40–220 BPM range. By measuring how hemoglobin absorbs and reflects light at different oxygen levels, you get precise data to optimize your training zones and maximize workout effectiveness.

Dual Connectivity: Bluetooth & ANT+

Connect simultaneously to multiple devices—smartwatches, cycling computers, fitness apps (Zwift, Strava, Wahoo Fitness, TrainerRoad, and more), and gym equipment. Choose the protocol that works best for your training setup.

Ultra-Lightweight & Comfortable

At just 20g total (11g sensor + 9g arm strap), the HS800 feels barely there during exercise. The adjustable Lycra band with Velcro fastening fits arm circumferences from 19.5–30.5cm and moves with you without restriction—no chest strap needed.

45+ Hour Battery Life

Extended continuous monitoring for multi-day training blocks. Fast magnetic charging keeps you workout-ready.

IP67 Waterproof & Sweat-Resistant

Train hard in any condition. The sensor maintains precision during heavy sweating, rain, and water exposure.

Key Specs: Bluetooth & ANT+ | ±1 BPM accuracy | 40–220 BPM range | 45h battery | IP67 waterproof | Magnetic charging | Adjustable 19.5–30.5cm armband