Logitech, wireless mouse M171 BLUE-K, operation: ambidextrous buttons: 3 (total), 2 (main), 1 (scroll wheel) Scroll wheel: 2-way tracking: LED-red/IR Illumination: - Connectivity: wireless (2.40GHz) Power supply: 1x AA Dimensions (WxHxD): 61.5x35.2x97.7mm Approximate volume: 55cm³ Weight: 70.5g Features: stowable. receiver, notebook mouse