• Battery life: 18 months
• Smooth optical tracking
• 90% noise reduced Left/Right-click, Middle click 8Sound level comparison between Logitech M221 and Logitech M170. Left click dBA measured by an independent lab at 1m.
• Nano receiver
• 1 AA battery (pre-installed)
• Connection Type: 2.4 GHz USB wireless connection
• Wireless range: 10 m