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Specifications
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HD 4.40BT
Specifications
HD 4.40BT
Ear coupling
Frequency response
Transducer principle
Sensitivity (microphone)
Sound pressure level (SPL)
Impedance
THD (1 kHz, 100 dB)
Pick-up pattern
Input power
Operating time
Charging time
Weight
Battery
Connectivity
Audio cable
(optional/detachable)
Connector
closed, circumaural
18 - 22,000 Hz
dynamic
100 - 10,000 Hz
113 dB (1 kHz/ 1 V
)
rms
18 Ω
< 0.5 %
dual omni-directional microphones
3.7 VDC, 600 mAh: built-in rechargeable
Lithium-Polymer battery
5 VDC, 400 mA: USB charging
25 hours
approx. 2 hours
approx. 225 g
Lithium Polymer
Bluetooth version 4.0/NFC pairing
1.4 m audio cable, 3.5 mm angled plug,
gold-plated
USB charging cable
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