2-Port KVM Switch w/ HDMI USB Audio Cables Peripheral Sharing 3-year limited warranty. Operating temperature range is 0 to 50 celsius and built in cable length is 48 inches. Note-pc keyboard combinations emulate mac keyboards and mac keyboards only work with their own computers. To ensure proper functionality, use a hub with an external power supply. In addition, kvm mouse emulation mode must be disabled. When switching ports, wait a few seconds for the selected computers video to display on the console monitor prior to switching ports again. Do not switch ports when a usb peripheral device is in operation. If using a wireless keyboard and mouse, the dongle must plug into the units keyboard port in order to use the hotkey function. Switch to the alternate HSM invocation keys