Support bluetooth enabled phones such as for iPhone and Android smart phones with easy connection property. With the microphone charged and connected with an amplifier or speaker, you can simply amplify your voice with the handheld microphones. Also easily turn it into a mixer Karaoke machine. Built-in 1800MA lithium battery,very convenient for charging, charging time: 3 ~ 5 hours and play time full charge intermediate volume 5-8 hours.