3 Modes Connection: Bluetooth 5.0/3.0 and 2.4GHz for you to choose from. The TECKNET Bluetooth wireless mouse allows you to switch freely between these three modes. With the Bluetooth connection mode, you can save a valuable USB port. The 2.4GHz USB receiver wireless technology enables plug-and-play functionality and provides a reliable working connection distance of up to 15M (49ft). No need to install drivers again. It is compatible with Bluetooth versions 5.2, 5.1, 5.0, 4.0, 3.0, and 2.0 Rechargeable Optical Mouse: Built-in rechargeable battery, requiring only 2.5 hours of charging for up to 90 days of use. This cordless mouse features auto sleep, quick wake, and long-time standby. It automatically enters sleep mode during inactivity. Simply click or move the mouse to return to work. Super Silent & Adjustable DPI: With 90% button noise reduction, this silent Bluetooth mouse is ideal for use in public settings or offices. It offers a wide range of DPI settings (4000, 2400, 1200