These 2.5mm male to 3.5mm male audio patch cables can be used to convert any speaker, headset or other device from a 2.5mm to a 3.5mm connection and vice versa.
The 2.5mm connector is the smaller cousin to the 3.5mm, which is just a little larger in diameter.
2.5MM Male to 3.5MM Male Stereo CableCB477-32-1BK
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Male to Male Stereo 3.5MM (1/8") Speaker/Headset/AUX (Auxiliary) Audio Cable