CablesOnline 10-PACK 3.5mm Mono Female Jack to 2.5mm Mono Male Plug Audio Adapter (AV-A39-10) (1) 3.5mm Mono Female (1) 2.5mm Mono Male 10 Pack of 3.5mm Mono Jack to 2.5mm Mono Plug Audio Adapters Black Molded Plastic Construction Nickel Plated Contacts