2.4g Ergonomic Trackball Handheld Finger Usb Mouse Wireless Optical Travel Dpi Mice For Pc Laptop Mac f54 1. Can be a key control: power switch.2. Enjoy 2.4G wireless technology, office casual games applicable.3. Innovative aluminum side roller design.4. Vertical side horizontal operation design, bid farewell to the "mouse hand".5. Wireless receiver, can be received within 10 meters of wireless.Specifications:: HXSJ Vertical mouseModel: T32Color Classification: BlackWireless technology: 2.4GHzWireless distance: 10mMicro switch life: 10 million timesNumber of keys: 6 keysBattery type: 1 x AA batteries (not included)Work: PhotoelectricProduct weight:93gItem size: 12.5x8x5.5cmPacking weight: 125gPackage Size:12.5 x9.3x 6.5cmRated voltage / current: 1.5V/5mAFour-speed DPI switching: 800-1600-2400-3600DPISystem Requirements: Windows 98/Me/2000/XP/Vista/Win 7/Win8/win10 or latest.Package includes:1 x Mouse1 x USB Receiver1 x English User ManualThree-level power saving mode:1: Three seconds into the first sleep light flashing continuously2: 1 minute or so to enter the secondary sleep, intermittent flashing lights3: 8 minutes or so, go to level 3 sleep, the light goes outHow to use:Open the battery cover and remove the microreceiver installed on the bottom of the mouse.Plug the receiver into your computer's free USB port.