The HRB500 does not have the ANT + protocol. It is only Bluetooth Smart. This therefore implies that its connection only works with bluetooth smart products. Be careful, many watches (like Garmin) or equipment are BLE and ANT + compatible but do not have the heart rate function in Bluetooth. Sometimes she is only ANT +. Bluetooth is used for other functions (SMS notifications, bike sensor, etc.). Check with the brand of your product.