UEELR UB-03 on ear Wireless Bluetooth Headphones over Ear Noise-Canceling Headphones,Foldable Having a good sound insulation performance and comfortable wear feeling.black Adopt wireless design, suitable for heavy bass play head beam structure for a long time wearing also is very comfortable Ear pad with 3 d stereo clipping, reduce oppressive feeling, wearing comfortable. USES the precision quality, to deliver music artists think the ideal state Unique vent cavity, control the bass frequencies of airflow, and optimize the diaphragm movement Dual mode adaptive noise cancellation function will silently in the world Easy to connect to the bluetooth Convenient connection switch, the use of the built-in rechargeable battery up to 15 hours