Each scanner comes with a different mix of wired and wireless connectivity options. These control which computers and mobile devices the scanner can work with. They also affect how quickly the scanner can send a scan to your device, as data transfer over Wi-Fi will likely be slower than over an Ethernet or USB 3.0 connection. USB will suffice for connecting a single computer. Bluetooth, Wi-Fi Direct, and Near-Field Communication (NFC) will let a scanner talk to a single smartphone or tablet. If you're looking for a scanner that multiple people can use, be sure it has Ethernet or Wi-Fi to connect to an office network or Bluetooth LE for handling various mobile devices. Some models don't have Ethernet pre-installed but can be expanded with an optional network interface unit. Your computer's or phone's operating system matters much less than it used to. Most major scanner manufacturers offer drivers and software for both Windows and macOS, as well as apps for both iOS and Android handheld devices, wherever some sort of wireless connection (NFC, Wi-Fi, Bluetooth, Wi-Fi Direct) is available. Some devices can also scan directly to USB flash drives.