Jabra BIZ 1500 Mono Specifications:

• User sound protection: PeakStop™ 118 dBA SPL (RMS)
• Speaker size: Ø 32 x 8mm (depending on model, some have slightly different dimensions)
• Speaker max input power: 30mW
• Speaker sensitivity: 102dB±3dB/1mW @ 1000Hz (varies slightly depending on model)
• Speaker impedance: 32±15%/1000Hz/1.0V
• Speaker frequency range: 20Hz-6.8kHz
• Microphone type: Noise-cancelling, Uni-Directional
• Microphone sensitivity: -35 to -31 dB@f=1kHz,. Pin=1Pa, 0dB=1V/Pa
• Microphone frequency range: 1-5kHz