Integrated Microphone with Built in Amplifier（MP135M） is an integrated MIC with built-in amplifier. The product is packed with two ceiling speakers. It has multiple audio sources, such as MP3, micro SD card, USB, recording and Bluetooth input. The functions include echo, microphone priority and removing the original voice of songs, etc. It supports intelligent real-time detection of load impedance. When the load is too heavy or short circuit, the output will be closed automatically. And the output will resume automatically when the load is normal. It is suitable for shops, markets, training institutions, ticket offices and other places.