Almost all tablet computers can access the Internet using Wi-Fi, and many can use mobile phone networks like 2G, 3G, 4G, and 5G. Like smartphones, many tablets have sensors such as a camera and a microphone. Other features tablets have are high definition, anti-glare (with less reflection) displays, a Bluetooth radio (to connect to printers and other devices), flash memory, and cloud storage services to back up information on the tablet and synchronize data.