Hi,my dear angel, welcome to Jacenvly, our products are cheap and good quality, price is fair, you can't miss it. If this product is not your style, please click on our store, we have many kinds of products, there will be you like and suits you. If you have any questions about your purchase, please send us the first message, we offer world class customer service to make your purchase without your worries. Have a nice day. HXSJ T29 Wireless Bluetooth 3.0 Mouse Ergonomic Design Vertical 2400DPI Mice Features: Bluetooth 3.0 wireless connection technology. Ergonomic designed to remit and carpal tunnel syndrome. Optical technology for control. User convenience with wow-pen's, pen-grip comfort. L/R mouse buttons, 2 thumb buttons, and a clickable scroll wheel , dpi button. You pick the hand position that best you. Plug and play,. Specification： Item type: Ergonomic Optical Mouse Resolution: 800dpi;1600dpi;2400dpi. Button: 4 buttons and 1 wheel (middle button) and dpi (adjusrable) Wireless Technoloy : Bluetooth 3.0 connection Maximum operating range: 10m Rated voltage /current:3V/8mA Power supply:2xAAA batteries(not included) Color: Black, Material: ABS Button click life:8 Million times System Requirements: Windows 98/Me/2000/XP/Vista/ Win 7/Win8/win10 or latest. Item size:13x6.4x7.7cm Item weight:87g Package size:15.5x8.5x8.4cm Package weight:125g (Including the weight of the packaging box) Bluetooth connection method： Turn on the mouse power directly. Then search for Bluetooth devices directly in the add device. Click to connect to the Bluetooth mouse,The device has been successfully added to this computer Package Included: 1 x Mouse 1 x English User Manua Note: Desktop computers need to be equipped with a Bluetooth receiver to use. phone is supported. HXSJ T29 Wireless Bluetooth 3.0 Mouse Ergonomic Design Vertical 2400DPI Mice Features: Bluetooth 3.0 wireless connection technology. Ergonomic designed to remit and carpal tunnel syndrome. Optical technology for control.