Feature: 1. Wide Compatibility: 4 in 1 karaoke mic can be used for microphone, Bluetooth speaker, MP3 player, recorder, compatible with various singing apps. 2. Two Way Connection: Wireless microphone can use Bluetooth connection and cable connection, you just need to connect your phone with cable or Bluetooth and then open the singing app on your phone. 3. Clear Sound, Vivid Sound Effects: Wireless microphone has built in clear sound and vivid sound effects, so you can listen and sing anytime and anywhere. You can also install Memory Card to use it. 4. Rich Interface: Bluetooth microphone has 3.5mm AUX, Memory Card, USB and charging ports. Built in Bluetooth speaker can be connected to any Bluetooth enabled source (smartphone, for iPhone, tablet, car, PC, etc.) 5. Superior Sound Quality: Bluetooth microphone's speaker vibration airflow reflux against the charge is small; sound reproduction is high, stereo; sound range coverage is wide, with excellent immersion and sense of existence. 6. Multifunctional Buttons: Bluetooth microphone has multifunctional buttons, easy to switch to different modes, adjust the microphone, back sound and music volume respectively, enjoy the fun of singing with music. Specification: Item Type: Wireless Bluetooth Microphone Material: ABS, Aluminum Alloy Bluetooth Version: Bluetooth 4.0 Frequency Response Range: 100Hz-10KHz Maximum Sound Pressure Level: ＞115DB 1KHz THD＜1% Reverb Mode: Sound Effect Reverb Built in Battery: 1800mAh 18650 Lithium Battery (included) Charging Power: DC 5V Sensor: Capacitor Output Power: 3W Interface: 3.5mm Aux, Memory Card, USB, Charging Port. Package List: 1 x Wireless Bluetooth Microphone1 x Charging Cable1 x Instruction Manual