AUSDOM Bluetooth 4.0 + EDR On-Ear Stereo Wireless Headphones AH2, Over-Ear Headset with Built-in Microphone High definition Stereo headphones provides more exact and natural sound than traditional stereo and a major step forward in the modern listening experience Powerful Energy: 400Am capacity, stand by 250 hours, 20 hours for playing steadily, charging(500mA 5V) full 2-3 hours Bluetooth V4.0+EDR: Bluetooth:Bluetooth V4.0+EDR save power and support range 10 meter surround, and 3.5mm audio cable connects to any device without bluetooth Listening: CSR BT 4.0+EDR with aptX chip gives you hi-fi sound, full frequency responses (20Hz-20kHz) provide rich bass Wear It: adjustable plastic head beams, soft sponge earmuffs, one-touch operation buttons