Cnet's Award: Cnet calls it "The Best Headphones for 2020". Hi-Fi Stereo Sound: Dual powerful 40mm sound stage drivers deliver true-to-life audio with rich bass that's just like the real thing. Engineered with advanced passive noise reduction, not active noise cancellation (ANC). It could prolong the lifetime of the battery and offers more real sound. Comfortable Design: In order to achieve perfect fit and comfortable wearing experience, the wireless headphones were designed with adjustable headband, metallic slider and protein leather the memory-protein cushioned earmuffs. The ergonomic design enables users to work long time without fatigue. Never Power off: Built-in rechargeable battery with a full charge of 4 hours enables your beats go on for a whopping 40 hours playtime. You could spend much less time charging and absorb more time enjoying. You could also use it as a wired headphone with the provided audio cable plugged into your earphone jack so the headphone will never power off. Excellent Connection & Hands-free Call: CSR chips and Bluetooth 4.1 technology provides quick and stable connection with your device, the device attachment is processed immediately with no waiting. Wireless headphone with a high-quality built-in microphone for hands-free calls, it offers you a quiet environment of connection.