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Specifications 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 ...detachable) Connector closed, circumaural 18 - 22,000 Hz dynamic 100 - 10,000 Hz 113 dB (1 kHz/ 1 Vrms) 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...
Specifications 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 ...detachable) Connector closed, circumaural 18 - 22,000 Hz dynamic 100 - 10,000 Hz 113 dB (1 kHz/ 1 Vrms) 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...