Loud hailer or Megaphone is the most common portable PA System gear in schools. Hence it is very likely the first PA System we ever encounter with. Though all Hailer / Megaphone looks alike but they are generally being classified by its way of handling; hand-grip or shoulder type. Pay extra attention to its weight, battery type and number of battery required as the battery will contribute to the total weight. Its loudness is determined by its Watt (RMS), the higher the Watt (RMS) the louder it is. Some Hailer / Megaphone comes with whistle or siren. Please check out our name brand TOA, Show and Unipex Hailer or Megaphone.