Microsoft - Wireless Mobile Mouse 3500 - Loch Ness Gray. BlueTrack technology; ambidextrous design; 2.4GHz wireless technology Microsoft Wireless Mobile Mouse 3500: Designed for portability, this wireless mouse features BlueTrack technology for use on nearly any surface, a nano transceiver that can be stored in the mouse or in your laptop for convenience and an ambidextrous design for comfortable use.