the sansa clip's impedance

MP3 players Sansa Clip | Clip+
1

I’m looking for a new earphone. I did’t find the sansa clip’s earphone’s impedance at the manual. Who knows the best earphone’s impedance for using with Sansa Clip?

best regards,

2

it’s 16Ω

32 will still work but it will not be as loud as 16