This selection features a variety of audio cables typically used for headphone connections. 3.5 mm is the most common headphone connector type, compatible with almost any pair of headphones or earbuds. Male to male and male to female plugs are available for extending a headphone connection. Other connection types include stereo cable to 3.5 mm and 2RCA or 3RCA to 3.5 mm, which are used for connecting personal devices such as an iPhone to an amplifier or receiver to produce hifi audio. Lengths range from 75 cm to 30 metres, however it is highly recommended to use an extender kit for sending signals over long distances.