The Poly Blackwire 3310-M is a Monaural USB-C Headset that is certified for Microsoft Teams. The Poly Blackwire 3310-M has an inline control unit that enables one-touch access to Microsoft Teams and call controls including: volume +/-, mute, answer and end. The Poly Blackwire 3300-M series offers best-in-class voice quality, customisable fit, flexible boom arm and 180-degree pivoting speakers. The Poly Blackwire 3300-M 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 214011-01 Specifications: Dimensions: H:6.0 x W:16.0 x D:20.0 cm Colour: Black Guarantee:2 years Material: Plastic Model Number: 100008799