The CatEye Optical Heart Rate Sensor easily pairs to your smartphone via app. It features a heart rate range from 40 to 220 bpm. It has a low battery indicator and automatically turns off after 15 minutes of no heart rate measurement.

• Optical heart rate sensor compatible with Bluetooth and ANT+
• Heart rate range 40-220 bpm
• Easy pairing via smartphone app
• Low battery indicator (less than 20%)
• Red LED blinks 3 times every 5 minutes until battery reaches critical level
• Automatically turns off after 15 minutes of no heart rate measurement
• Waterproof construct IPX7