Sennheiser Momentum 4 Wireless Black, Mic, Battery time up 17 hrs
Article number (SKU) - 509266 (black), 509267 (white)
Wearing style - Headband stereo headphones
Ear Coupling - Around-the-ear, circum-aural
Connectivity - Bluetooth 5.2 compliant, class 1, 10 mW (max)
Transmission frequency - 2,402 MHz to 2,480 MHz; GFSK, ?/4 DQPSK / 8 DPSK
Supported Profiles - A2DP, AVRCP, HFP
Codecs - SBC, AAC, aptX™, aptX adaptive™
Speaker Type - Dynamic
Transducer principle - 42mm diameter
Speaker frequency range - 6 Hz to 22 kHz
Speaker sensitivity - 106 dB SPL (1 kHz / 0 dB FS)
Total harmonic distortion (THD) - Speaker: <0,3% (1 kHz / 100 dBSPL)
Impedance - Speaker: Active 470 ohms / Passive 60 ohms
Active Noise Cancellation - Hybrid Adaptive ANC
Microphone principle - MEMS
Frequency response (microphone) - 50 Hz to 10 kHz
Microphone pick-up pattern - 2 mics per side, beamforming for noise reduction
Battery 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 times
Battery type - Built-in Lithium-Ion rechargeable batteries 700 mAh
Power Supply - 5 V?, 800 mA max, USB charging via USB-C socket

https://www.sennheiser-hearing.com/en-US/p/momentum-4-wireless/