Lightweight design - as the lightest jbl Bluetooth Sport earphone, the reflect Mini bt provides long lasting comfort during a variety of athletic activities. Connectivity Technology: WirelessBuilt-in microphone - easily answer calls with Crystal clear sound and remarkable convenienceSweat proof - confidently ramp up your workouts to maximum levels knowing that the reflect Mini bt are not only ipx-4 water resistant but can be easily cleanedErgonomic ear-tips - designed to stay securely in place during rigorous exercise. Highly reflective cable designed for ultimate visibility at nightBluetooth wireless - designed for freedom during exercise