Rechargeable Microphone & LED DisplayBoth microphones & receiver can be rechargeable. Microphone and receiver are built-in 1200mAh rechargeable lithium-ion battery. Working time up to 10 hours plus with charging time of 2 to 3 hours. With dual USB charging port for charging. The LED display can show the battery power and signal strength in real time, don't worry about suddenly not working. 15 Adjustable Frequencies & Alloy MaterialThis UHF wireless microphone for dj is pre-programmed with 15 selectable frequencies, all with superb signal stability and eliminating radio interference. The outer shell of the bluetooth microphone wireless is alloy material which is harder, lighter and more wear-resistant, this wireless handheld microphone has a better weight and grip experience. Plug and Play & One-click MuteThis jbl microphone wireless is easy to use, no need to pair, only plug and play! Tap once to mute, tap again to restore sound, which can avoid making noise