Note: Please adjust the headphone to the most favorable position and then adjust the volume for this bone conduction headphones but also your smartphone, it will surprise you. Warm Tips: Compare with normal headphones, it is built in bone virator and open ear. the sound lacking is a comment issue for almost all the bone condcution headphones. because the it would start to vibrate and be uncomfortable if the sound is too high It's worth a try if you need to keep your ears open and driving safe. 1. Over-the-ear design 2. Adopting bone conduction tech, not like in the ear headphones, this bone conduction headphones is to open you ear to the surroundings and traffic, keep you safe when your are driving, cycling or outdooring. but it is NOT an hearing aid. for hearing problems, please ask professional assistance for help 3. Bluetooth 4.1, stereo streaming outout offer dymanic music experience 4. Compatible with almost all the cellphones and tablets and more Specification: -Bluetooth version:4.1 -Bluetooth profile: AVRCP, A2DP, HFP, HSP -Built in microphone, hands free call -Studio output: Yes -Sweat proof: Yes, IPX4 water protection -Noise cancellation: Yes, CVC 6.0 tech -Frequency: 20Hz-20khz -Working distance: 33ft -Working temperature: -10℃ to +65℃ -Call time: 5 hours and more -Playback time: 5 hours and more -Battery type: rechargeable li-on battery -Charging time: about 3 hours -Charging port: Micro USB (DC 5V)
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