SPECIFICATIONS:<br /><br />    Drivers: 57mm speaker X 2<br />    Transducer type: dynamic<br />    Bluetooth version: V4.1<br />    Frequency range: 2.4GHz-2.48GHz<br />    Operating distance: up to 10m (free space)<br />    Bluetooth profiles: A2DP?AVRCP?HSP?HFP<br />    Impedance: 16?<br />    Frequency response: 20Hz-20kHz<br />    Sensitivity: 110dB<br />    Distortion:<0.1%(THD)<br />    Music playtime: up to 40 hours<br />    Talk time: up to 45 hours<br />    Standby time: up to 1625 hours<br />    Charging time: about 2 hours<br />    Operational temperature: -10 to 50 C<br />Customized function<br />Audio Sharing allows you to connect to another H headset via an audio cable・ and share music with your friends (* it is recommended that headphones with impedance of 32? or higher be used). Simultaneously connect two Bluetooth devices・ connect with your phone and tablet seamlessly・ and  listen to music as you please!<br /><br />Iconic powerful bass resonance<br />57mm ultra-large dynamic drivers・ turbine style housing・ and Bluedio's iconic surging low-frequency shock let you feel deep bass resonance for superior sound quality.