public address megaphone for 300m range

{"cid":"91219484","title":"20W Public Address Megaphone Handheld Megaphone With Recorder 6V Lead Acid Battery","imgUrl":"https:\/\/img.chinax.com\/nimg\/fa\/44\/b1edf155e6e11d3b52c0e62aef40-200x200-1.jpg","attrs":{"Brand Name":"OEM","Model Number":"JM-8SB","Minimum Order Quantity":"100-300","Delivery Time":"15-25 days","Certification":"CE","Place of Origin":"China","Payment Terms":"T\/T, Western Union, MoneyGram","Supply Ability":"5,000 Capacity Monthly","Packaging Details":"Packaging 1pc Color box , 8pcs Carton","Name":"Public Address Megaphone","Battery":"6V Lead-acid battery or Lithium battery","Battery Life":"8-10 Hours","Power Socket":"6-24V External by Cigar Lighter Line","Frequency Range":"70Hz-20KHz","Impedance":"4\u03a9","Material":"ABS Plastic Housing","Siren":"Built-in","Microphone":"External","Power":"30 Watt","Accessories:":"Shoulder Strap","Use Scope :":"Police , Fire ,School ,"}}

{"cid":"91220556","title":"Full-Range Audio Crossover High Power Megaphone for Public Address Safety Alarm 50W","imgUrl":"https:\/\/img.chinax.com\/nimg\/ae\/74\/b4cf7e4f88b15d7771753fe82c7e-200x200-1.jpg","attrs":{"Price":"$14.50\/pieces 100-299 pieces","Brand Name":"UM AUDIO","Model Number":"UM3002R","Minimum Order Quantity":"100 pieces","Power Source":"Battery, DC","Support Apt-x":"NO","Support APP":"NO","Battery":"NO","Number of Loudspeaker Enclosure":"1","Audio Crossover":"Full-Range","Set Type":"Speaker","Feature":"Display Visual Information","Material":"Plastic","Waterproof":"NO","Communication":"AUX, usb, Audio Line","PMPO":"50W","Support Memory Card":"Yes","Speaker Type":"PORTABLE","Output Power":"25W","Remote Control":"NO","Cabinet Material":"Plastic","Frequency Range":"60Hz-23KHz","Display Screen":"NO","Intelligent Personal Assistant":"none","Voice Control":"NO","Built-in Microphone":"Yes","Private Mold":"NO","Type":"Active","Use":"Portable Audio Player, Outdoor","Channels":"1","Special Feature":"Wireless, PORTABLE","Place of Origin":"China","Certification":"ce","Packaging Details":"Gift box and standard export master carton","Port":"Ningbo, Shanghai","Supply Ability":"500 Piece\/Pieces per Day"}}