HushUp Silent Ergonomic Mouse 100% Noise Reduction with Adjustable DPI Mouse Sensitivity (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 PLUG & PLAY ~ This silent wireless usb mouse does not require any software or downloading & is under warranty from date of purchase.