Dual magnetic speaker, noise-reduce technology The surface was made of radium and electroplating Built-in Bluetooth code, wireless & wired both can connect . Wireless singing: switch on, Bluetooth connection, music play, vocal volume, start karaoke. Song recording on cell for phone/PC/Ipad: audio cable connection, cell phone connection, open App, debugging and save the song. USB cable to charge, 4 hours to fully charged, it can be used continuously on the microphone. Answer a call: it can be after the microphone connected to the cell phone.