【PARTICULAR DESIGN】 - The excellent design of karaoke microphones is very suitable for your hand, which let you feel more comfortable. And the built-in high-quality Bluetooth module can be used as a wireless speaker, mp3 player, and recorder, compatible with various singing applications. 【HIGH COMPATIBILITY】- Supporting micro SD card max 32GB(NOT INCLUDED) and song switch. The Bluetooth has a great distance of connection(10m). 【EASY TO USE】- Multi-function buttons, easy to switch to different modes, adjust microphone, echo, and music volume separately, enjoy singing along with the music. With echo mode, a karaoke mic can bring a surrounding immersion.