Speaker size 28mm Speaker sensitivity 115db@1mW-1kHz Speaker max input power 30mW Speaker frequency range 20Hz – 20 000Hz Speaker bandwidth – music mode 20Hz – 20 000Hz Speaker bandwidth speak mode 100Hz – 12000Hz Microphone type 1 Analog MEME and 1 Analog ECM Microphone sensitivity -38BV/Pa / -33dBV/Pa User hearing protection Jabra SafeToneTM