Specification: Product Name: Wireless Headphones Headband Material: Polyester Color (Optional): black, hemp gray Size: 27 x 10cm Bluetooth version: 5.0 Bluetooth transmission distance: 10 meters Headphone channel: stereo (2.0) Music playback time: maximum sound 7H, medium volume 10 hours Feature: Our sleep Bluetooth headset is made of high-quality materials, Bluetooth 5.0 version, the sound quality is very clear, easy to use, very suitable for your home or travel. Notes: Due to manual measurement, there will be an error of 1-3 cm. Parts List: 1x Bluetooth music sleep headset headband 1x USB charging cable