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This article focuses wireless keyboards and mice. The radio frequency receiver, which connects the keyboard and/or mouse to the personal computer, is a key chain-size adapter that plugs into a Universal Serial Bus port. Radio frequency keyboards and mice must be no more than a few feet away from the receiver with relatively clear line of sight to operate. A newer way to go warless is with a keyboard and mouse that use Bluetooth. this technology allow the personal computer to communicate to as many as seven Bluetooth-ready devices up to 30 feet away, and the devices do not need to in view of the base station or Universal Serial Bus adapter to connect. However, Bluetooth keyboards and mice cost more than their radio frequency counterparts. During most tests, Bluetooth devices took longer to install, and some connections were occasionally shaky. The Basic Wireless Optical Desktop from Microsoft Corp. comes with 25 programmable buttons and is priced at $65. The Cordless Click Plus Optical Mouse has great navigation features. The DiNovo Media Desktop from Logitech comes with a detached numeric keypad, which works great as a remote control for music files. However, the DiNovo has a steep price. INSET: Cut the Cords: Wireless Input Devices.