Connect and switch between up to three devices at a time (computer, tablet, or phone). Windows, macOS, iOS, and Chrome OS compatible. Compact design. Smooth, responsive scissor keys include multimedia hot keys. Low battery indicator. Dual wireless using Bluetooth? (3.0 or 5.0) or 2.4GHz wireless with 128-bit AES encryption security. Three-year warranty. English. 2 "AAA" batteries included. Black.