For PCs, Macs, and mobile devices, Poly Blackwire 3325 Wired Dual-Ear Boom Mic with USB C and USB-A and 3.5mm Noise-Canceling Mic Collaborates with Groups (Certified): From the producer Compatibility USB/USB Type-C® compatible with PCs, 3.5 mm connectors for tablets and smartphones (BW3315/BW3325), and USB Type-C® compatible devices Mic length (mm) for ColorBlackBoom: 135 mm Microphone sensitivity: 11 dB SLR Ratio of signal to noise >24 dBI 32 ohmCab impedance