Adapter from 3.5 mm female to 2.5 mm male Jack.
The adapter has a 3.5 mm female Jack at one end and a 2.5 mm male Jack at the other end.

Audio adapter microUSB / 3.5mm.

MusicMan Soundstation Mini Stereo Speaker - black.
MUSICMAN Stereo Speaker system with an excellent sound quality, small package top of the line sound This sound station is made out of aluminum and palstic case, in a trendy, modern design. Has a pleasant blue light screen for all music information.

Original Nokia AD-52 audio adapter.
2.5mm to 3.5mm
Package: Bulk.

Original Sennheiser HD 201 headphones.
The HD 201 is a pair of closed, dynamic stereo headphones for the budget-conscious music lover, featuring powerful sound reproduction, good attenuation of ambient noise and outstanding wearing comfort.

Goobay Soundball Speaker - Black
Great active mini speaker for MP3 players, mobile phones, notebook and laptop computers and other portable audio devices.