This product is either discontinued or we cannot get that from suppliers.
JABRA Biz 2400 Ii Mono Usb 3-1 Mic 2496-823-209, Headset - Bluetooth - wireless, wired - USB, On-ear - convertible, Wireless, wired, Bluetooth, Max Input Power 20 mW, Controls Volume, mute button, answer/end, programmable button.
The Jabra BIZ 2400 II Mono 3-in-1 USB/NC/BT/MS Headset is a variant that features a USB connector and Bluetooth, for connecting to your PC or a mobile device.