Plantronics Encorepro Hw520 Headset>

Headset Type: Binaural (over-the-head, dual-ear). Connection: Wired via Quick Disconnect (QD) or with USB adapters (sold separately). Speaker Size: 2.6 mm. Microphone Type: Unidirectional. Microphone Bandwidth: 150 Hz to 6.8 kHz. Speaker Bandwidth: 150 Hz to 6.8 kHz. Signal-to-Noise Ratio: >50 dB. Sensitivity (Microphone): -40 +/-3 dB. Weight: 74 grams. Cable Length: 785 mm (78.5 cm). Dimensions (W x D x H): 11.1 x 14.9 x 6.7 cm. Compatibility: Works with PCs via USB, RJ9, or 3.5mm jack with appropriate