iMouse E90 Wireless Left-Handed Vertical Ergonomic Mouse is designed with a vertical orientation and a contoured shape that provides a uniquely comfortable user experience. Designed specifically for left-handers, this wrist-friendly contour support, you will hold your hand in a healthy handshake position which is the neutral position of your forearm. This feature prevents your forearm from twisting when using this vertical ergonomic mouse. Featuring two ergonomic buttons that are located conveniently on the side of the mouse allowing seamless back and forth browsing. The 800/1200/1600 switchable DPI control provides three levels of mouse cursor speed that works in different environments. iMouse E90 - The advanced optical sensor technology keeps the mouse precisely on point and lets you work on most glass, wood, marble and leather surfaces without a mouse pad.Reduces Carpal Tunnel Syndrome (CTS)The wrist-friendly contour of the Adesso vertical mice allows you to hold your hand in a neutral handshake position, minimizing your forearm muscles from twisting and the possible development of Carpal Tunnel Syndrome. Normally, your forearm muscles are twisted from sitting flat on the supporting surface when using a regular mouse. This flat position causes strains on your muscles and leads to wrist pains. This is where the Adesso Vertical Mice become helpful and provide alleviation.Cable Free Wireless TechnologyPlug and Play 2.4G wireless connection up to 30ft (10m )range. Work freely without constraint and mess of cable.Ergonomic Vertical Design Made for Left-HandersThe vertical design provides better support for your forearm minimizing wrist pain that can come from twisting.50 Degree Vertical AngleThe hand-shake grip helps reducing muscle stress and risk of Carpal Tunnel Syndrome.Adjustable DPI SwitchAdjustable cursor moving speed from 800, 1200 to 1600 DPI.Back/Forward ButtonsProvides extra convenience for web surfing and other controls under windows OS.Auto Sleep and Power On/Off SwitchMaximizes your battery life up to 6 months and reduces consumption of batteries.Durable Micro-switchUp to 10 million times lifecycle.Nano ReceiverTiny and convenient to plug into to your laptop or tablet.High-precision Optical SensorTracks accurately and precisely on different surfaces, like marble, wood and leather surfaces.Specifications:Tracking Method: Optical SensorConnectivity: USBResolution: 3 Levels (800/1200/1600)Buttons: 6 Buttons (Left & Right Click, Back & Forward, DPI Switch, Scroll Wheel)Hand Orientation: Left Hand OrientationDimension: 3.0 x 4.7 x 2.5 (75 x 125 x 63 mm)Weight: 0.3 lb. (113 g)Certificates: FCC, CE, ROHS, WERCS, IC: 23351-XPACQ1System Requirements:Operating System: Windows 2000 / XP / Vista / 7 / 8 / 10Connectivity Interface: USB Port for Wireless Receiver