Professional Excelvan for K18V Portable Bluetooth Wireless Microphone With Receptor for Bar KTV Home Party Speech Presentation Features: 1.Bluetooth 2.1 EDR, you can connect the microphone with you phone and any devises supported. Then play background music. 2. The wireless available distance is up to 10m. 3.Line-in mode, which support 3.5mm-3.5mm audio cable, so you can connect with more devices which do not support Bluetooth. 4.600mAh Li-Battery, extending the usage time. You can charge the battery through USB cable. 5.It can be used at any occasions, such as home karaok , making presentation, addressing speech, giving lessons and hosting meetings. 6.You can adjust the volume of background music through MUSIC VOL key. It has the memory function, which stores the setting before you turn it off, and next time you turn it on, it won’t be changed. 7.Background music can be adjusted automatically as long as you push the MIC FIRST button. When you talk to the microphone, the background music turns down automatically. 8.You can push the ECHO knob to adjust the reverberation effect of the microphone, making yourself a DJ. And you can adjust the Volume through MIC VOL, with out reaching other devises. 9.Light in weight, easy to carry. 10.It is compatible with some KARAOK Apps, you can enjoy your home KTV with your family and friends. 11.It is a wonderful party assistant. 12.Easy and friendly to use. Cause you are not confused by lots of cables.