Wireless karaoke microphones

The wireless microphone sends the signal wirelessly to the receiver. So your wireless microphone doesn't need a microphone cable. However, the receiver must be connected to a mixer or other device with a microphone input with a cable. 
MadBoy wireless microphones use two AA batteries. Wireless microphones usually run on batteries for just under ten hours. With rechargeable batteries, the operating time is slightly shorter. 

Wireless microphones can be sorted into two groups: handheld transmitters and pocket transmitters. Handheld transmitters are handheld vocal microphones. An instrument (such as a guitar), headset or tie microphone is often connected to the pocket transmitter.