Ausdom M04 Bluetooth Headphones Over-ear Stereo Wireless + Wired Headsets/headphones with Microphone for Music Streaming and Hands-free Calling M04 headphones can be used both wired (stereo audio only) and wireless for streaming music Built-in 400Am rechargeable battery provides you about 18 hours for both talk and audio play time Excellent over-the-ear design for noise isolation guarantees the clarity of sound Full range audio spectrum (20Hz-20kHz) for deep bass, all the way to crystal clear high frequencies Each pair of headphones from BAgain comes with our 100% satisfaction guarantee and 1 year warranty