Logitech M221

Connectivity: 2.4 GHz wireless via nano USB receiver (plug-and-play) with up to approx 10 m range in ideal conditions. Sensor/Tracking: Optical tracking at 1000 DPI (typical) for everyday tasks. Buttons & Scroll: Standard three-button setup (left, right, scroll/middle) and line-by-line scroll wheel. Size & Weight: Compact size — approx 99 × 60 × 39 mm and weight about 75.2 g with battery in many listings. Battery: Uses 1 × AA battery (included) and offers up to 18 months of battery life (depending on usage) with power-saving features (on/off switch, auto sleep). Design: Ambidextrous (suitable for left or right hand), compact/portable shape, built for everyday/office use. Compatibility: Works with Windows, macOS, Chrome OS, Linux. Eco-credentials: Some versions list carbon footprint and sustainable design elements. Silent clicks