INCREDIBLE SOUND QUALITY - The aptX-Adaptive audio transmission code combines stability, good sound quality, scalability and low latency, and the upgraded full-range sound covers the frequency range of 20-20kHz for the human ear. With the SUUNTO Wing bluetooth headphones, you will get an excellent audio experience!. CLEAR VOICE CALLS - Adopting the CVC (Clear Voice Capture) noise reduction technology, the two built-in HD microphone is capable of capturing your voice and removing the ambient noise intelligently. Whether you are running or cycling, the SUUNTO Wing headphone with mic ensures the crystal-clear calls for you.. OPEN-EAR BONE CONDUCTION TECH - SUUNTO Wing open-ear headset uses bone conduction technology to transmit sound waves without leakage issues, keeping your ear canals open to listen to audio and hear the surroundings to reduce the risk of accidents effectively. And compared to traditional in-ear or over-ear headphones, the open-ear headphones won't damage your eardrums