Asiproper 90 Grad Universal 3,5 mm OMTP zu CTIA Kopfh?er Konverter Adapter Kabel
In other words, OMTP earphones are compatible with CTIA phones and also CTIA earphones compatible with OMTP phones. Compatible plug standard: OMTP to CTIA or CTIA to OMTP. There are OMTP and CTIA two standards.