Use a higher quality headset with your smartphone, iPhone, or tablet Convert standard 2.5mm phone headset plug to 3.5mm plug Use your phone headset with iPhone, Blackberry, Motorola, Palm, or other smartphone 3.5mm headset jack Great for traveling, carry just one headset Works with most 2.5mm mono headsets Product Details Product Dimensions: 5.7 x 4.2 x 1.2 in Product WezioTEK