【4-in-1 Karaoke Microphone】— Besides a wireless microphone, the BONAOK mic can be used as a portable Bluetooth speaker, MP3 player. This Karaoke Microphone is powered by a built-in rechargeable battery pack. The battery is a permanent, non-removable component of the device — not user-serviceable or replaceable. Designed as a complete, sealed unit to ensure safety and reliability. The built-in high-capacity battery pack delivers extended runtime for multi-day use.If the battery is forcibly removed, it may cause damage to the battery and render it unusable 【Controllable Dynamic LED Light】— Music~ 27 colorful LED lights will flicker with the rhytModazone of the music. Higher volume, brighter light, perfectly creating a karaoke atmosphere for you. If long pressing "M", the LED light will appear/ disappear. 【Excellent Live Show】— Multi-layer denoising head, powerful stereo speaker, professional buttons, and brief layout, all allow you to enjoy an aural carnival. Let this microphone light up your party. 【Easy to Use】— Via Bluetooth and memory function, the karaoke player can be easily connected to your phone. Also, support TF card plug and play(not included). Wherever you'd like to sing or listen to music, this moving speaker will meet all of your needs.