Wireless Bluetooth Headphones TF card Supported Very pure and clear sound Very useful for athletes and gamers Quality Premium is a masterpiece Very comfortable on the ear Very elegant style Enjoy the wonderful music all the time You can use it via Bluetooth or wired Equipped with noise cancellation feature It is isolated from external sound, meaning it is completely separated from disturbance You can use the TF memory card (listen without connecting it to the phone) Easy to change the size and a comfortable headrest so that you do not get tired during use Features: Bluetooth, TF Card, microphone (TF card Not included) Bluetooth Version : 5.1 Driver size : 40mm Frequency Response : 20Hz - 18KHz Impedance : 32 Playback time : 6~8hours Charge time : 2hours Battery : 3.7v 400mAh TF Card access port WARNING: DON'T disassemble this product ENSURE responsible use of the headphones DON'T expose this product or any of its components to water fire or high temperatures or damp areas DON'T attempt to use this product when performing tasks that require your full attention