The Poly Blackwire 3315 is a Monaural Headset that offers USB-C and 3.5mm jack connectivity. The Poly Blackwire 3315 features best-in-class voice quality, customisable fit, flexible boom arm and 180-degree pivoting speakers. The Poly Blackwire 3315 has an inline control unit that enables one-touch call controls such as volume up / down / mute, answer and end. The Poly Blackwire 3300 series are compatible with windows and Mac operating software. They are suitable for prolonged periods of use thanks to a padded headband, soft ear cushions and lightweight design. Features: Corded USB Headset Crystal Clear Calls 213937-01 Specifications: Dimensions: H:6.0 x W:16.0 x D:20.0 cm Colour: Black Guarantee:2 years Material: Plastic Model Number: 100008789