Sennheiser Momentum 4 Wireless Black, Mic, Battery time up 17 hrsArticle number (SKU) - 509266 (black), 509267 (white)Wearing style - Headband stereo headphonesEar Coupling - Around-the-ear, circum-auralConnectivity - Bluetooth 5.2 compliant, class 1, 10 mW (max)Transmission frequency - 2,402 MHz to 2,480 MHz; GFSK, ?/4 DQPSK / 8 DPSKSupported Profiles - A2DP, AVRCP, HFPCodecs - SBC, AAC, aptX™, aptX adaptive™Speaker Type - DynamicTransducer principle - 42mm diameterSpeaker frequency range - 6 Hz to 22 kHzSpeaker sensitivity - 106 dB SPL (1 kHz / 0 dB FS)Total harmonic distortion (THD) - Speaker: mai mic de 0,3% (1 kHz / 100 dBSPL)Impedance - Speaker: Active 470 ohms / Passive 60 ohmsActive Noise Cancellation - Hybrid Adaptive ANCMicrophone principle - MEMSFrequency response (microphone) - 50 Hz to 10 kHzMicrophone pick-up pattern - 2 mics per side, beamforming for noise reductionBattery time - Up to 60 hrs music playtime via Bluetooth and with ANC (test condition: iPhone, mid volume level)Charging time - Approx. 2 hrs for full charge; 5 min charging for up to 4 hrs playtime; Remark: Ambient temperatures >30°C may lead to extended charging timesBattery type - Built-in Lithium-Ion rechargeable batteries 700 mAhPower Supply - 5 V?, 800 mA max, USB charging via USB-C sockethttps://www.sennheiser-hearing.com/en-US/p/momentum-4-wireless/