1、DIGITAL SIGNAL PROCESSOR: With sound drivers and advanced digital signal processor, the sound is more accurate and the volume is more moderate and balanced without any noise. Press and hold the volume button to adjust the volume. 2、BLUETOOTH 5.0 CHIP: Portable karaoke machine has a built in bluetooth 5.0 chip for wireless streaming, ensuring instant pairing and providing more stable transmission and longer range. 3、COMPATIBLE DEVICES: Portable karaoke machine supports micro memory card, flash USB and AUX input connections. Compatible for Android phones, TVs, tablets, and computers. 4、WITH 2 UHF MICROPHONES: Bluetooth karaoke machine with 2 UHF microphones provides higher power output, wider frequency shift, better dynamic range and signal to noise ratio. 5、LONG LIFE SPAN: Bluetooth speaker has a built in 2400mAh high efficiency lithium ion battery to ensure uninterrupted music playback, and the microphone has a built in 1200mAh high efficiency lithium ion battery. 6、LIGHTWEIGHT AND PORTABLE: Karaoke machine is lightweight, compact and portable for you to enjoy with your family and friends, perfect for family gatherings, classrooms, presentations and many other occasion.