Sennheiser HD350BT

Frequency response (Microphone) : 80 Hz to 6,000 Hz (-3 dB)
THD, total harmonic distortion : < 0.3 % (1 kHz, 100 dB)
Transducer principle : Dynamic, closed
Pick-up pattern : Dual Beamforming
Transducer principle (Microphone) :MEMS
Bluetooth Version : 5.0
Frequency response : 18 Hz to 22,000 Hz (-10 dB)
Modulation scheme : GFSK, π/4 DQPSK, 8DPSK
Battery Specification : Built-in Lithium-Polymer rechargeable battery: 3.7 V ⎓, 300mAh
Charging Current : 320 mA max.
App support : EQ and updates via Sennheiser Smart Control
Audio codec : SBC, AAC, AptX™, AptX™ Low Latency
Supported Profiles : HSP, HFP, AVRCP, A2DP
Charging time : Approx. 2 hours
Charging voltage : 5 V, DC
Ear coupling : Around Ear
Operating time : 30 hours music playback via Bluetooth
Sound pressure level (SPL) : 108 dB (1 kHz/0 dBFS)
Transmission frequency : 2,402 MHz to 2,480 MHz
Weight : Approx. 238 g