This Rockin' mic is built for fun and good times anywhere! It features big time, blasting audio and dazzling music-syncing lights. Just pair your Bluetooth device to get the party started. The 6 built-in voice changers will take your performances to the next level. If you're feeling brave, remove the lead vocals from any song with the touch of a button. Does party machine refer to the microphone or the person using it? That's up to you to decide! Number of Batteries: 1 Features: Bluetooth Compatible, Plug And Play Battery Type: Lithium Ion Measurements: 10 Height/Inches, 2.2 Width/Inches, 3.4 Length/Inches Base Material: 80% Plastic, 20% Metal Country of Origin: Imported