The karaoke machine transmits wirelessly via the latest built-in Bluetooth 5.0 chip, ensuring instant pairing, providing more stable transmissions and longer distances. The portable karaoke machine also supports micro memory cards, USB connectivity, and can even be used as a rechargeable battery to charge phones and microphones. It is suitable for your smart device, TV, pad, tablet and PC. This karaoke speaker has a built-in rechargeable 1500mAh lithium-ion battery, which can play music for 5 hours continuously, and the microphone has a built-in 300mAh rechargeable lithium-ion battery. You can sing any song you want no matter where you are. Equipped with audio frequency engine and advanced digital signal processor, clear sound, moderate volume, no noise. Press and hold the volume button while playing music, and easily adjust the desired volume level. Small speaker, convenient to carry, whether at home or travel, you can put it in the car, suitcase or briefcase, suitable for indoor and outdoor parties, singing at family gatherings, etc. Bluetooth karaoke machine with 6 kinds of sound effects, standard, KTV, female, male, doll voice, multiple voice changing, one key switch, can meet more needs, bring more fun. Very suitable for outdoor family parties, classrooms, speeches and many other occasions.