Unexpected 57mm ultra-large dynamic drivers and turbine style housing, let you feel the bass resonate deep in the chestSoft ear pads and breathable head beam, comfortable to wearAdvanced Bluetooth 4.1 connection, 72MHz 16/32 bits high-speed processingSeamless connect two Bluetooth devices simultaneouslyDSP intelligent noise cancelation, bring excellent music and calling experienceBuilt-in 11 Equalizer modes, press volume +/- at the same to switchLine in/out 2-in-1 interface, support input music via 3.5mm audio cable, or output music to another earphoneAcoustic echo cancellation and noise reduction effectively reduce ambient noise while talkingIncorporate 4 languages voice prompt (Chinese, English, French, Spanish)Large capacity built-in battery, long-endurance time, 40 hours of music time, 45 hours of talk time, 1600 hours of standby timeWide compatibility, applicable for iOS, Android and Windows phone systemsSupport both Bluetooth or non-Bluetooth devicesSpecifications:: BluedioModel: HTDrivers: 57mm speaker x 2 Transducer type: dynamic Bluetooth version: V4.1 + EDROperating distance: up to 10m Bluetooth profiles: A2DP, AVRCP, HSP, HFP Impedance: 16Sensitivity: 118dBFrequency response: 20Hz-20kHzDistortion: 0.1%(THTD) Music playtime: up to 40 hours Talk time: up to 45 hours Standby time: up to 1600 hours Charging time: about 2 hours Operational temperature: -10 to 50CSize: 175 x 85 x 182mmCompatible with:Apple iPhone, iPod, iPad seriesSamsung HTC Blackberry Xiaomi etc. Bluetooth enabled smartphonesSupport non-Bluetooth devices via 3.5mm audio cablePackage included:1 x BLUEDIO HT Turbine 57mm Driver Bluetooth 4.1 Over-ear Headphone with Mic Line In/Out1 x 3.5mm Audio Cable (about 150cm)1 x Micro USB Cable (about 100cm)1 x User Manual