Stay connected and aware of your heart rate with bose Soundsport pulse wireless in-ear headphones in red. These earbuds feature in-ear heart rate monitoring that transmits your data to the bose connect app or popular fitness apps. They can store up to eight paired devices and pair with up to two devices at once via Bluetooth 4.2. Users with compatible mobile devices can connect with a tap via NFC. They also offer proprietary stayhear+ eartips that conform to your natural ear-shape for a more secure and comfortable fit. These features render them suitable for use during the most vigorous of exercise routine.