Наушники KOSS CS 25

Single sided headphone with electret, noise cancellation microphone for hands-free communication from your cellular or radio frequency (RF) telephone
Compatible with most cellular and RF telephones with 2.5mm jacks
Frequency Response: 30-16,000 Hz
Clear Voice TechnologyTM noise cancellation microphone delivers clear communication in noisy environments
Microphone Impedance: 2k ohms
Foam ear cushion for open, hear-through sound
Adjustable headband for best fit
Straight, single entry 8 foot cord

Frequency Response 30-16,000 Hz
Cord Straight, Single Entry, 8ft
Impedance 32 ohms
Weight 2.5 oz.
Sensitivity 91 dB SPL/1mW
Distortion <1.0%
Ear cushions open