2021 design version: Ergonomic 2.4G wireless vertical mouse designed to reduce wrist fatigue and prevent uncomfortable "mouse hands" during extended use. Key benefits and features - Ergonomic vertical design on a 2.4G wireless mouse helps alleviate wrist strain and promotes a more natural hand position during use. - Forward and back buttons are positioned for easy page navigation while browsing the web, improving efficiency. - Smooth, skin-friendly surface and solid workmanship provide a comfortable feel and durable performance over time. - USB receiver is stored in the battery compartment for convenient transport and minimal setup. - Requires 1 AA battery (not included); please peel off the transparent protective film on the bottom of the mouse before first use. Practical use scenarios - Office work and data entry: reduce wrist fatigue during long sessions and maintain comfortable posture. - Web browsing and document review: quickly navigate pages with the forward/back buttons without moving the hand to the keyboard. - Home and travel use: wireless connectivity with a simple setup, suitable for use at home, in the office, or on the go.