Qt-y11: it is composed of a frequency wide capacitive diaphragm radio head and high-performance electronic circuit, with high-quality radio effect
Qt-y506: it is composed of a frequency width capacitive diaphragm radio head and high-performance electronic circuit, with high-quality radio effect
Qt-y507: it is composed of a frequency wide capacitive diaphragm radio head and high-performance electronic circuit, with high-quality radio effect
Qt-y720: it is composed of a frequency wide capacitive diaphragm radio head and high-performance electronic circuit, with high-quality radio effect