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===Remote focus unit===
Many memory consoles have an optional Remote Focus Unit (RFU) controller that can be attached to the light board and used to control the board's functions (though usually in some limited capacity). They are usually small enough to be handheld. This is ideal in situations where moving the light board is impractical, but control is needed away from where the board is located. That is, if the light board is in a control room that is located far from the fixtures, such as a catwalk, an RFU can be attached and an electrician or the lighting designer can bring it to a ___location which is close to the lights. Some of the newer and more advanced boards have RFUs that can be connected through USB or even wirelessly. Also, some mobile phone/tablet apps can be used to control newer lighting systems such as ETC's (electronic theater controls) app called iRFR for Apple devices or aRFR for Android devices.
Various manufacturers offer software for devices such as [[Android (operating system)|Android]] and [[IPhone|iPhones]] that cause the devices to act as remote controllers for their consoles. Also, independent software developers have released applications that can send [[Art-Net]] packets from an iPhone, thus enabling an iPhone to serve as a fully featured console when used in conjunction with an Art-Net to DMX converter or Art-Net compatible luminaries and dimmers.
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