Samsung WEP650 - Manual (Page 9)

Wearing.on.the.headset
Place the headset on your ear. Ensure to put the correct (Left, Right)
earpiece on each ear. Your headset has the E-Clip feature which keeps
the headset stable on your ear with the adjustable earpiece.
Depending on what ear you are going to wear the headset, simply adjust
the ear hook accordingly.
 Left  Right