This Eartec ComSTAR wireless headset comes with a battery. However, be aware that the muff on one side is starting to show signs of disintegration.

Using this Eartec ComSTAR wireless headset is easy. Just make sure the battery is properly installed and turn it on to start enjoying wireless audio. When using, keep it away from strong magnetic fields as it may affect the signal. As for maintenance, clean the headset regularly with a soft, dry cloth. Since one side's muff is starting to disintegrate, handle it gently to avoid further damage. If the disintegration gets worse, you may need to consider replacing the muff.