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Specifications
HD 250BT | 25
Specifications
Model: HD 250BT
Bluetooth
Wearing style Bluetooth® on-ear
Ear coupling on-ear
Transducer principle dynamic, closed-back
Transducer 32 mm
Frequency response 20 Hz to 22,000 Hz (-10 dB)
Sound pressure level (SPL) 110 dB (1 kHz/0 dBFS)
THD (1 kHz, 100 dB SPL) < 0.3 % (1 kHz, 100 dB SPL)
Microphone principle ECM
Microphone frequency
response
100 Hz to 10,000 Hz
Microphone pick-up pattern
(speech audio)
omni-directional
(1 microphone)
Power supply built-in rechargeable lithium-polymer
battery: 3.7 V ⎓, 190 mAh
USB charging: 5 V ⎓, 120 mA max.
Charging time of
rechargeable battery
approx. 3 hrs
Operating time 25 hrs (music playback via SBC) with
headphones' rechargeable battery
Temperature range operation: 0 °C to +40 °C
charging: +10 °C to +40 °C
storage: –20 °C to +60 °C
Relative humidity operation: 10 to 80 %, non condensing
storage: 10 to 90 %
Weight (headphones) approx. 125 g
Magnetic field strength 1.6 mT
Version Bluetooth 5.0 compatible, class 1, BLE
Transmission frequency 2,402 MHz to 2,480 MHz
Modulation GFSK, π/4 DQPSK, 8DPSK
Output power 10 mW (max)
Profiles HSP, HFP, AVRCP, A2DP
Codec aptX, aptX LL, AAC, SBC
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