- For connecting loudspeakers or headphones to a mobile phone - Due to the microphone which is integrated into the adapter, HiFi headphones can be used as fully functioning headset - Call management functions, depending on the telephone model (call answer/end, voice dialling, etc.) - For universal use with devices with micro USB interface - Loudspeaker/headphone connection: 3.5 mm jack - Mobile phone connection: micro USB - Extendible roll-up cable: max. 70 cm