Best Compatible with Bluetooth 4.0 Chip: Compatible with more than 99.8% of Bluetooth devices. This Bluetooth mouse works with any Bluetooth-enabled laptop or iPad iPhone with iOS13 or later. Automatic Energy-Saving Sleep Mode: Lithium polymer battery, long lifespan. The Auto Power Off function helps you save energy as your Bluetooth mouse turns off when your computer is turned off or the receiver is disconnected. Eight minutes without a mouse enters sleep mode, which can be awakened by pressing any key. BUILT-IN BATTERY: Built-in battery, convenient micro-USB charging cable, no need for an extra AAA battery anymore. Keep the mouse power in the "ON" position while charging. ERGONOMIC DESIGN: Fine surface coating technology gives you a skin-like touch. The ergonomic design provides all-day comfort for work and play, portability and pocket size are perfect for travel, and the silent design keeps you away from annoying clicks. QUIET OF SILENT MODE BUTTON: Whether you are in a dormitory, library, or office, don't worry about affecting others.