Bluetooth Wireless Headphone Stereo Music Calling TF Card FM Radio Headset - Black Features: Ergonomic design fits the shape of the head and is comfortable to wear 40mm large dynamic unit, more powerful bass 5.0 Bluetooth technology, faster transmission, and more stable signal Support Bluetooth music and call, support AUX/TF card/FM Easy to adjust the headband and the headphone head can be rotated 90 degrees Specifications: Function: Bluetooth 5.0 hands-free call, true stereo, TF card playback, FM radio Bluetooth version: 5.0 Transmission distance: 10 meters Speaker size: 40mm Wired connection: by 3.5mm audio cable Music playback time: about 8 hours Charging time: about 2 hours Battery capacity: 350mAh Package Included: 1 x Headphone 1 x Charging Cable 1 x User Manual