Wireless keyboards connect to a PC in one of two ways: via Bluetooth or a USB receiver. Wireless keyboards that connect via a USB receiver or dongle can only connect to a computer or device if it has a USB port. Bluetooth connectivity on the other hand does not require any dongle or extra receiver and can therefore easily connect to other Bluetooth-enabled devices without the need for any ports. Additionally, Bluetooth keyboards tend to cost a little more but also offer longer battery life. While shopping, you may find that older devices do not support Bluetooth. However, if you need a keyboard to work across different platforms on newer devices, a Bluetooth-enabled model is the way to go.