[Product Information]

This item is passive noise isolating, NOT active noise cancellation(ANC), it can't cancel the noise completely but it won't drain the battery and damage the sound. As an additional factor of sound quality, it is better than ANC. 2. The closed-back design provides immersive Hi-Fi sound with CSR chip and 40mm driver together. If you care more about Noise Cancellation than Sound Quality, you may consider other alternatives.
The ear cushion simulate human skin texture, ensuring lasting comfort. The stainless steel slider and softly padded headband allows you to find the perfect fit without constraint and provide excellent durability.
1.The wireless mode: A built-in 220mAh battery provides up to 5-hr music time/5-hr talking time in a single charge; 2. The Wired mode: you can also use it as a wired headphone with the provided audio cable so the headphones will never power off.
The Microphone only works in the wireless mode. Firstec Bluetooth headphones provide a quick and stable connection with your Bluetooth enabled devices like cell phones, tablets, pc, TVs within 33 feet, with a high-quality built-in microphone for hands-free calls.
The foldable Headband is designed for saving your desk space.Gentle Reminder: Depending on your head/ear size/shape, it may be a little tight(feels like“on ear”) for someone to wear which is designed to avoid sound leakage. In case of that and to get both audio and wearing comfort, please take off the headphone every 1-2 hrs to get your ears relax and protect them from muggy environment in use.90 days warranty will be guaranteed. If you have any questions or problems,Contact us!