Nokia XpressMusic AD-56 3.5mm to 2.5mm Headset Adapter for Nokia 3600 Slide 5610 XpressMusic 5700 XpressMusic 6121 Classic 6210 Navigator 6220 Classic 7610 Supernova Brand New Nokia XpressMusic AD-56 3.5mm to 2.5mm Headset Adapter Controller. Genuine Nokia headset adapter for connecting universal 3.5mm (1/8 inch) headsets/headphones or external speakers to the phone's 2.5mm connector. The AD-56 works perfectly with the Nokia HS-45 headset (not included - sold seperately). Compatible with Nokia Phones with 2.5mm connector: Nokia 3600 Slide, 5610 XpressMusic, 5700 XpressMusic, 6121 Classic, 6210 Navigator, 6220 Classic and 7610 Supernova.