Celebrat A4 Wireless Headphones

Brand name:celebrat model number:a4 style:headband communication:wireless connectors:usb use:portable media player, mobile phone, computer function:bluetooth, microphone, noise cancelling place of origin:guangdong, china (mainland) drive unit:40mm impedance:32ω charging time:2h input voltage:dc 5v bluetooth version:v4.2 standby time:2 months transmission distance:10 m certificate:ce rohs fcc playing time:8-10 h battery capacity:300mah