[2020 Upgrade] Anker Soundcore Liberty Air X True Wireless Earbuds with Charging Case, Qualcomm aptX, Touch Control, 28 Hour Playtime, Graphene Drivers, Noise Cancelling Microphones, Secure Fit Expertly Tuned Graphene Drivers: Liberty Air?s drivers utilize graphene?a material 100 times harder than steel and 35% lighter than traditional driver diaphragms. They oscillate with extreme precision to deliver sound with a wider soundstage, exceptional accuracy, and crystal-clear clarity across the entire frequency range. aptX technology further enhances your experience by seamlessly transferring music without compromising quality. Crystal-Clear Calls: The wireless earphones are equipped with dual microphones that utilize the latest cVc 8.0 noise reduction technology . Your voice is optimized and background noise is minimized so you sound louder and clearer on the other end. Up to 28 Hours of Playtime: A full 7 hours of listening on a single charge is extended to a huge 28 hours of playtime with the included charging case. Integrated Touch Control: Use the earbuds to answer calls or play, pause, and skip music on-the-go. Secure-Fit: Liberty Air wireless earphones have a lightweight in-ear design and multiple EarTip sizes to allow you to customize the fit of the earbuds. Crank up the comfort level and enjoy music and stereo calls with superior noise-isolation. Expertly Tuned Sound: Graphene drivers produce a wider soundstage with exceptional accuracy and clarity. Your music is transferred via Bluetooth in the highest possible quality thanks to aptX technology. Crystal-Clear Calls: Dual microphones with cVc 8.0 noise reduction technology effectively highlights your voice while reducing background sounds. Up to 28 Hours of Playtime: Enjoy 7 hours of playtime on a single charge and extend to 28 hours with the charging case. Integrated Touch Control: Use the wireless earphones to answer calls or play, pause, and skip music on-the-go. Secure-Fit: Liberty Air X wireless earphones have a lightweight in-ear design and multiple EarTip sizes for comfortable wearing. Specifications Key Specifications Audio Sensitivity: 97db SPL Frequency: 20Hz-20kHz THD+N: = 3% Antenna Return Loss: Typical: -14dB Limit :-12dB Microphone: MEMS Omnidirectional Mic Audio Source: iPhone, iPad, Samsung, Blackberry, Nexus, Smartphone, Computer, PC, Notebook, MP4, MP3, etc. Proprietary Technology: Graphene-Enhanced Drivers, Exclusive Composite Diaphragm