Brand Microsoft Color Light Grey Connectivity Technology Bluetooth Special Feature Wireless Movement Detection Technology Optical About this item Compatibility :Windows 10 / 8.1 / 8;Host must support Bluetooth 4.0 or higher.(Note: many Apple and Windows 7 devices do not support Bluetooth 4.0.) Ultra-slim and lightweight;Design:Bendable tail Snaps flat and slips easily into a pocket or Bag Optimized design for the most natural interaction Innovative full scroll plane lets you scroll both vertically and horizontally. Wireless frequency:2.4GHz frequency range