... INPUTBATTERY UP TIMEOVER 8HMAX EFFECTIVE DISTANCE400SQ.M.MATERIALTAIWAN CHIMEI 757ABS IC MAX POWER OUTPUTRMS20WECHOLOUDSPEAKER OUTPUT3-5WFREQUENCY RESPONSE150HZ-10,000HZ+-1DB CURRENT ... 600) VOLTAGEDC 7.4V INTERNAL LITHIUM BATTERY14650,1050MA INSIDEBATTERY PACKSEICO IC CHIPDUAL PROTECTION CERTIFICATESISO 9001:2008,CE,FCC,CB PACKING DETAILS1 ...