This allow you to use your favorite 2.5mm earphone with any 3.5mm Mobile Phone.PDA, IPAQ, MP3 player or audio player device.

Description : 
3.5 mm male stereo jack to a 2.5 mm female jack
Converting "full size" jack plugs to audio
equipment fitted with mini-jack sockets

Change some moblie phone , MP4 , MP3 and CD player to use 2.5 mm earphone .
Some moblie phone , MP4 , MP3 and CD player is 3.5 mm plug , so this adapter is use for let them to use 2.5 mm earphone.

Package Included :
1 x 3.5mm to 2.5mm Adapter Plug