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We know you are particular about headphones: You want them to be outstanding in performance, also to be stylish in look. But we’re bold enough to take this challenge and Bluedio A (air) comes along. Our Bluedio a (air) wireless headphones deliver your music with incredible depth and clarity and get you noticed with stylish look. Compatibility: The Bluetooth perfectly works with your smartphone, tablet or Bluetooth enabled MP3 player. Instruction tips: Turning 3D sound on: When the headphones are playing music via Bluetooth, press the MF button and vol+ button together then release the buttons immediately. You will hear an indication note, the 3D sound is on. Email Bluedio customer service, get answered under 24 hours: To email Bluedio customer service: You can click ‘your account’ on Amazon, click ‘your orders’, find the Bluedio order, click ‘contact seller’. Specifications â 1. Bluetooth version: V4.1. 2. Supported profiles: A2DP, AVRCP, HSP, HFP. 3. Bluetooth operating range: up to 10m (free space). 4. Transducers: Ï 57 mm x 2. 5. Impedance: 16Î©. 6. Frequency response: 15 Hz-25 kHz. 7. Sound pressure level (spl): 118 dB. 8. Bluetooth music/talk time: Up to 20 hours. 9. Standby time: Up to 1000 hours (about 41 days). 10. Charging time: 2.5 hours for full charge. In the box â 1. Bluedio a Bluetooth headphones. 2. User manual. 3. Carry case with a buckle. 4. Audio cable, talk cable with remote (only for talk not for music), Y audio cable. 5. USB charging cable. 6. Pouch for cables.