Tri-mode BT5.1+BT5.1+2.4GHz: Unlike Bluetooth 4.0 wireless mice, this wireless mouse is equipped with an upgraded Bluetooth 5.0 chip to provide a more stable, low-latency connection. The 2.4Ghz wireless connection is more anti-interference, plug and play, no driver required, and up to 3 devices can be connected. Switch between 2.4GHz wireless and Bluetooth with the flick of a switch on the back. Rechargeable and Battery Level Indicator: The mouse features a transparent and cool casing to keep track of the battery level. The built-in high-performance rechargeable battery lasts up to 30 days on a full charge and has a long standby time, taking only 40 minutes to fully charge. Four-speed adjustable DPI and high-precision optical tracking: Featuring four-speed adjustable DPI (800/1200/1600/2400).