Features 1 100 brand new and high quality 2 Support Karaoke App Download and install Karaoke App on your smart phone or tablet You can enjoy your home KTV with your family and friends 3 Flexible frequency varying operation This microphone supports 10 channels optional 4 Adopting full digital signal to transmit audio and instrument information with powerful capacity of resisting disturbance High Signal Noise Ratio Performance Broad Frequency Response Range Low Distortion 5 Ensure over 15 meter transmission distance 6 Bluetooth connected or LINE IN port with smart phone TV tablets STB and etc Line in mode which support 3 5mm 3 5mm audio cable so you can connect with more devices which do not support Bluetooth 7 Full metal shell with LED screen which can display the battery levels8 User friendly that had already pairing the transmitter and receiver for you Just do as the User Guide 9 Compatible with 1 5 volt AA battery NOT included in the package 10 Comfort and smooth handling experience with elegant appearance11 Accessory with 1 antiskid ring 12 Multi linguistic user manual English Spanish Italian German Japanese French Russian etc 13 It can be used at any occasions such as home karaoke making presentation addressing speech giving lessons and hosting meetings 14 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