1、You can adjust the volume of the background music through the MUSIC VOL key, press the MIC FIRST button to adjust the background music. 2、It has a memory function, it stores the settings before closing, and it will not be changed when it is opened later. 3、When you talk to the microphone, the background music is automatically turned off, easy to use, friendly, don't be confused by many cables. 4、You can press for ECHO knob to adjust the microphone's reverberation effect and make yourself like a DJ. 5、Compatible with some KARAOKE applications, you can enjoy family KTV with family and friends. 6、Lightweight and easy to carry, suitable for outdoor and indoor parties, such as family karaoke, lectures, courses and hosting meetings. 7、The sound and recording quality are perfect, you can sing anytime, anywhere, connects to the phone via bluetooth, easy to set up. 1 x Microphone1 x Receiver Box2 x D3.5mm Audio Cable1 x D3.5 Female and for RCA Male Connector1 x USB Charging Cable1 x Strap1 x Anti-Slip Ring1 x Manual Item Type: Bluetooth MicrophoneMaterial: ABS+AluminaColor: Black+GoldWeight: Approx. 303.0g/ 10.7ozSNR (Signal to Noise Ratio):> 70dBDistortion: ≤ 0.5%Working Distance: About 15mBluetooth: EDR 2.1Frequency Response: 50Hz-5KHzLithium Battery: 600mAh