TechHutt Ergonomic Silent Mouse 100% Noise Reduction & Adjustable DPI Mouse Sensitivity - (HushUp 2.0 Black) 100% NOISELESS MOUSE ~ Whisper quiet mouse click COMFORT ~ Ergonomic Comfortable Design combined with sweat-resistant material for extended sessions PRECISION ~ 3 Adjustable DPI Settings (1000, 1200, 1600) & precise optical lasor sensor tracking for crisp responsiveness and stability AUTOMATIC SLEEP FEATURE ~ Turns the mouse off to conserve battery power when the mouse becomes inactive, USB nano receiver is unplugged, or if the PC is turned off CONNECT & PLAY ~ This silent wireless mouse does not require any software or downloading & is under warranty from date of purchase.