This product is either discontinued or we cannot get that from suppliers.
KENSINGTON ACCO Pro 72451, Black, Compatibility Vista, Windows 7, XP, Windows 8, Windows 8.1, macOS 10.12 or above, Range (ft/m) 30/10, Bluetooth 3.0.
The easy and reliable technology allows you to connect your mouse without the need to use one of your valuable USB ports, which can be highly convenient on modern ultra-thin devices like Chromebooks™/Ultrabooks™.