features Advanced BT 4.2 (CSR4.2) technology, Built-in high-grade Microphone Speaker, hands-free function and lightweight design. X1T BT Headphone will offer you wonderful music, you can greatly enjoy your favorite Music. A super companion for you during daily life and travel. Features: [Advanced BT Technology] Latest Wireless BT 4.2 (CSR4.2) Technology with A2DP/ AVRCP support, ensure transmitting strong signal in high quality high speed and offering high-fidelity stereo music, filling your world with premium sound: from richest bass to a pure, balanced response for natural sound. [Unique Design] Wireless Dual Ear Stereo Design, Left and Right Ear Channel Separation; You can use X1T'S Left and Right Ear Headset solely (Single Track Mode), and X1T also can be used in pairs (Stereo Mode). Ultra Mini Size(its diameter is only 16mm), offering you Wonderful HiFi Sound Effect. Its ergonomic design guarantees 100% Stable and Comfortable when walking, exercising, running, climbing, driving, skating, cycling, fishing and other outdoor sports. [Strong Wireless Signal Multipoint Technology] With a wireless audio range of 66ft (20m), enjoy the freedom to move and the convenience of uncompromising sound quality. And can simultaneously connect two smarts phone. So you can seamlessly switch between your business and personal phones. [CVC6.0 Noise Cancellation High-sensitivity Mic] Adopt Built-in CVC6.0 Noise Canceling Technology and high-sensitivity microphone to reduces ambient noises and grasp the detail of voice, enabling clearer sound from microphone. You can get high quality hands-free phone conversation even on the street or inside a shopping mall. [Long Standby Time Fully Compatibility] Built-in rechargeable Lithium battery lasts up to 4 hours of Talking Time / 4 hours of Music Playing Time and 220 hours of Standby Time per charge cycle. And universally compatible with most BT-enabled devices, including iOS / Android / Windows Smart phones Tablet PC iPad, and other BT devices. Also Supports real time monitoring of battery voltage and early warning of low voltage, also support auto power-off when ultra-low voltage. Note: The headset will be conveniently used to make and answer calls, and only one of the two included headsets will work when make and answer calls.?