Thinkpad X1 Active Noise Cancellation Headphones

HEADPHONEHEADSET DRIVER : 40 MMFREQUENCY RANGE : 20 HZ – 20 KHZIMPEDANCE : 32ΩMAX. INPUT POWER : 30 MWSENSITIVITY (SPL) : >111 DBM ± 3 DBMTHD+N AT -3 DBFS : -77 DBDYNAMIC RANGE : 110 DBBATTERY SUPPORT : 15 HOURS (PLAYBACK);20 HOURS (WITH ANC OFF)BATTERY CHARGE TIME : <2 HOURSMICROPHONETHD+N AT -3 DBFS : -85 DBDYNAMIC RANGE : 95 DBFREQUENCY : 50 HZ - 8 KHZACTIVE NOISE : ANALOG ANC, UP TO -30 DB,CANCELLATION (ANC) 4 X MICROPHONESSUPPORTS ANC OFF/ : LEVEL 1 = -20 DB;LEVEL 1/LEVEL 2 LEVEL 2 = -30 DBENVIRONMENT : 2 X DEDICATEDNOISE CONTROL (ENC) DIGITAL MICROPHONESNOISE SUPPRESSION : UP TO 45 DBSIGNAL-TO-NOISE RATIO : UP TO 19 DB(SNR) IMPROVEMENTINTERFACE BLUETOOTH® 5.0, USB-C (USB-C DIGITAL AUDIO STANDARD)BLUETOOTH® PROFILE A2DP, HFP, AVRCPBLUETOOTH® AUDIOFORMAT SUPPORT SBC / AAC / APTX / APTXLL / HP1.7 / MSBCCABLE LENGTH USB-C TO USB-C : 1.3 M BRAIDED CABLEUSB-C TO USB-A : 1.3 M RUBBER CABLEHEADPHONE TYPE ON-EAR DESIGN, FOLD-FLAT ENGINEERINGMICROPHONE TYPE BOOMLESSWEIGHT STARTING AT 0.43 LBS (195 G)SUPPORTED OS • WINDOWS 10 • ANDROID™ 8.0 OR LATER • IOS 10.0 OR LATERSHIP GROUP(WHAT’S IN THE BOX)• THINKPAD X1 ANC HEADPHONE• CARRYING CASE• 1.3 M USB-C TO USB-C BRAIDED CABLE• 1.3 M USB-C TO USB-A RUBBER CABLE• WARRANTY• INSTRUCTION MANUALWARRANTY 1 YEAR