SENNHEISER Over-the-Head Bluetooth Stereo Headset with Noise Reduction (MM 450) Type: Bluetooth Car kit Noise Reduction: Yes Ear Coupling: Over the Head Talk Time: Up to 20 hour(s) Music Time: Without NoiseGard 10 hour With NoiseGard 8 hour Charge Time: 3 Hours Operating Range: 33 Feet Specifications: Transducer principle: Closed acoustics Headphone Frequency response: 15 – 22.000 Hz THD, total harmonic distortion: Less than 0.1% at 1KHz Sound pressure level (SPL): 107 dB Microphone Frequency response: 100 – 10.000 Hz Pick-up pattern: omni-directional
