Compact with Silent Ergonomic Design for Laptop and Desktop Computer Black (Blue (Silicone))

Ergonomic design: The contoured shape and curved soft rubber grip comfortably hold your hand.
Energy saving: With automatic sleep and activity switches, energy efficiency is incredible.
Precise tracking: Advanced optical tracking allows for precise scrolling and page turning on almost any surface.
Quiet operation: Click and scroll silently at night without straining your hands.
Long battery life: A single AA battery (not included) provides ample power and can last up to two years without needing a battery replacement.