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1. Supports simultaneous connection of 3 devices, and can switch freely between BT5.0, BT3.0 and 2.4GHz modes to easily cope with multi-device usage scenarios. 2. Built-in rechargeable battery, fully charged in 1.5 hours for continuous use for 1-2 months, supports charging while using, equipped with automatic sleep and key wake-up functions, energy saving and power saving. 3. Vertical ergonomic design effectively reduces wrist and arm pressure, making long-term use more comfortable. 4. Provides 4800/3200/2400/1600/1200/800 DPI five-speed adjustment to adapt to a variety of usage scenarios, accurate and smooth. 5. Designed for medium to large hands, the size is 4.73 x 2.96 x 2.48 inches (12 x 7.5 x 6.3 cm). It is recommended to measure the hand shape before purchase to ensure comfort. 6. Equipped with forward/back buttons to improve the efficiency of web browsing and document operation (side buttons do not support MacOS). 7. Widely compatible with Windows, MacOS, Linux, Android and iOS (10.4+), plug and play or quickly connect via Bluetooth.