The Plantronics MX250 headset is an ear-hook style earbud designed for use with devices that have a 2.5mm jack. The headset features a boom microphone and comes in black. This lot includes four MX250 headsets and is a great choice for those who need multiple headsets for personal or professional use. The MX250 is a single earpiece headset and is model number MX250MCAE. It was manufactured in Mexico and is not a custom bundle or modified item.