2 Micro-USB connection Ringer on the base Supports busylight Yealink Acoustic Shield Technology Talking Time up to 13h (Mono) Wireless range up to 160m Weight 1.55 lbs Dimensions 10.5 ? 8.5 ? 4.5 in Brand Yealink Headset Type Mono, UC Certified, USB Microphone type: dual microphone Microphone sensitivity: -44.0+/-3 dBV Microphone frequency range: 100 Hz-10 kHz Speaker size: ? 28 Speaker sensitivity: 92.5+/-3 dB, 0.179 V Speaker impedance: 32+/-4.8 O Speaker max output power: 10 mW Speaker frequency range: 20 Hz-20 kHz Speaker bandwidth - talk mode: wideband,100Hz - 8kHz Speaker bandwidth - music mode: super wideband, 20Hz-20kHz (Pending) Peak Block Protection (EN50332) Australian G616 Protection (AU G616) Daily Noise Exposure Protection