1. Unique Three- Zone Backlight Design: This Bluetooth keyboard designed with 7 colors and 3 brightness levels (low medium high) backlit. Our advantage: The keyboard is divided into three areas. You can use FN+L/M/R to adjust the light color. Each area can adjusta 7 different colors. 2. 3-Device Keyboard: Equipped with two Bluetooth channels and one 2.4G wireless channels. This multifunctional Bluetooth keyboard can connect up to 3 devices simultaneously. 3. High Capacity Rechargeable Battery: Equipped with a built-in 1200mAh rechargeable battery and automatic sleep function, the keyboard can operate for up to 320 hours without backlight. The charging time is 3.5 hours. No need to replace the battery. Including charging cable, fully charge before first using the keyboard. 4. Full Size Bluetooth Keyboard: Full size keyboard, equipped with convenient Numeric keypad and multi-function keys, improves work efficiency. 5. Widely Compatibility: This keyboard can be used in Windows, Android, Mac OS, and iOS system devices.