Lantoo Bluetooth Headphones V4.1, Foldable Sport Wireless Headphones On Ear, 45H Play Time BLUETOOTH 4.1 STEREO HEADPHONES WITH IMPRESSIVE SOUND QUALITY: CVC 6.0 passive noise cancelling, 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 active noise cancellation. BUILT-IN INTELLIGENT PEDOMETER APP & MICROPHONE: Uses smart APP (For Android OS), and built-in pedometer will keep your fitness activity, so you will know exactly how many calories you have burnt and the distance you have covered. With high-quality built-in microphone for hands-free calls, Lantoo Bluetooth headphones provide a quick and stable connection with your Bluetooth enabled devices within 33 feet.(Please Note: The Microphone only works in the wireless mode.) BUILT TO STAY COMFORTABLE: A high-quality leatherette headband and velour covered over ear cushions provide wearing comfort for long listening sessions. NEVER POWER OFF, BOTH WIRELESS & WIRED: 1. The wireless mode: A built-in 800mAh high capacity battery provides up to 45-hr music time/60-hr talking time/180-hr standby time in a single charge;2. The Wired mode: you can also use it as a wired headphone with the provided 3.5mm audio cable so the headphones will never power off. FOLDABLE DESIGN WITH A PORTABLE CARRYING CASE: The foldable Headband is not only designed for saving your desk space but for carrying in the provided protective case. Gentle Reminder: Depending on your head/ear size/shape, it may be a little tight 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.