Item Type: Adapter The current mainstream mobile phone headset plugs are mostly 3.5mm, 4 segment plugs. Although the plug size specifications of all brands are the same, different national standards are not compatible with each other. The role of this adapter is to allow these two different formats to be converted, that is, OMTP headphones can use CTIA standard mobile phones. On the contrary, OMTP standard mobile phones can also be used for CTIA-standard headphones. Can be universally converted. Compatible Brand: OMPT to CTIA or CTIA to OMTP Durable, compact, and lightweight ensure the best quality of sound colour: black Material: metal size: Connection Type: 3.5mm Length: 4.3cm(Approx.) Package Contents: 1*Adapter Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.