Take center stage, with the iSing Karaoke Microphones. This mp3 microphone gives you the power to customize your performance to sing with (or without) accompanying vocals. For an enhanced experience, this microphone comes with different volume and light up lights.  Number of Batteries: 1 Features: Bluetooth Compatible, Portable, Built In Light, Mp3 Compatible, Battery Operated, Light-Up Battery Type: Lithium Ion Measurements: 10.75 Height/Inches, 2.75 Width/Inches, 2.75 Length/Inches Base Material: 70% Plastic, 30% Acrylonitrile Butadiene Styrene Country of Origin: Imported