Lenovo ThinkPad X1 Head-mounted Active Noise Reduction Bluetooth Headphones 1. ANC active noise reduction technology, adjustable in three levels, accurately captures external noise and emits reverse sound waves to superimpose and eliminate it in milliseconds. Whether it is an open office environment, commuting to and from work, or on a business trip, it can help us at any time Escape from the noise and build your own "independent space". 2. ENC environmental noise reduction technology: With the support of dual microphone arrays, through software and hardware collaboration, it automatically identifies different noises, separates and eliminates environmental interference noise in real time, and enhances the clarity of human voices, ensuring high-quality calls in more environments. . 3. Bluetooth 5.0+ dual Bluetooth connection: It can connect to a computer and mobile phone at the same time, and switch between the two devices freely. Only one headset can meet the needs of multiple usage scenarios. 4. 40mm ultra-large neodymium magnet driver unit, full loudspeaker, high and low 5. The 214g lightweight ergonomic body is equipped with multi-layer memory foam earmuffs, which are skin-friendly and comfortable to fit various head shapes, and can be worn for a long time without any burden. 6. Foldable body, easy to store and save space. 7. Built-in high-performance and long-lasting battery, you can listen freely and solve your battery life anxiety. 8. Equipped with an exclusive storage box, compact design, exquisite and practical, making it easier to carry when traveling. Specification: 1. Drive unit: 40mm neodymium magnet drive unit 2. Headphone frequency response range: 20Hz-20KHz 3. Microphone: 6x omnidirectional analog microphone 4. Microphone sensitivity: 36dB 5. Signal-to-noise ratio: 60dB 2 x omnidirectional digital microphone 6. Multi-function button: microphone mute switch 7. Connection method: Bluetooth 5.0 (dual-way) 8. Charging cable length: 1.3m 9. Dimensions: 232mm x 210mm x 70mm