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. 2 "AAA" batteries included. Three-year warranty. English. Silver.