?GREAT CUSTOMER SERVICE?[90 Day Money-back Guarantee],[365 Days Warranty (replacement service) ],[Lifetime Technical Support]. If our vertical mouse does not fit your hand well,welcome to contact us for help,you'll get free replacement/refund without hassle at any time. ?WIDELY USED?The vertical wireless mouse is suitable for use in the office,home,school. Lightness and easy to carry,you can put it in the computer bag and take it to the coffee shop,library,office and business trip. ?WIDE COMPATIBILITY?Ergonomic mouse wireless compatible with PC,Laptop,Computer,Desktop. System include Windows 8/9/10/XP,Windows Vista,Linux,with hardware connectivity by wireless USB Receiver. If you are using a Linux,need to set related software then mouse can be used normally. ?TOP RUBBER GRIP AND NICE MATTE COATING?Mouse texturized rubber grip ergonomically-design for your thumb rest and grip well. Great matte coating offer very comfortable touch,especially for people who works at the computer for hours. ?ADJUSTABLE 3 DPI HIGH SENSITIVITY?Upgraded 3 DPI 800/1200/1600 options, gaming mouse enables to adjust DPI as you want,provide sensitive, smooth and precise tracking. The vertical wireless mouse is also constructed with 6 buttons with multifunctional functions to improve productivity and efficiency in daily work. ?2.4G WIRELESS, EASY TO USE?One USB receiver is inside the battery compartment. When using the optical cordless Mice,please remove the USB receiver and then install 2*AAA Dry Batteries(Buyer need to prepare Battery by himself/herself). Just Plug and Play! Mouse will turn to sleep mode in 7mins of inactivity for energy saving,easily activated by clicking any buttons. ?ERGONOMIC MOUSE FOR YOUR RIGHT HAND?The wireless mouse with upgraded optical ergonomic and friendly design keeps your hand and arm staying more naturally. The ergonomic shape encourages healthy neutral "handshake" wrist and arm positions. Effectively smoother movement and less overall strain,compared with a regular wireless mouse.(The forward/back buttons are not compatible with Mac OS).