2.5mm gsm data cable usb serial cable gsm T189, T190, T191 ... /CP2102/PL2303HX Electronics configuration: USB serial(TTL 3.3v) to 2.5mm gsm data cableUSB gsm upload, backup, upgrade cableCP2102, FT232, PL2303 ... service features. Compatible Phones: T189, T190, T191 usb ttl to 2.5mm AJ male cable, , gsm data cable for T189, T190, T191 ...