Nice microphone with stereo speakers, you can connect smartphone via bt or insert memory card(Not Include). Fine quality noise reduction and clear music rhythm with echo-reverberation. Aluminum alloy surface, 3 layer high-density noise reduction. This microphone suitable to put into your bags when you are traveling or camping. It's perfect for gatherings or home KTV, and you will have fun with your friends or family. BT technology for lower energy consumption but more stable connection and faster transmits speed, effective wireless operating distance is up to 10m. Easy to use with bt, compatible with most bt devices, easy to operate and pair.