... -560 Portable belt amplifierSpecifications:Output Power:6W(maximun)Output Impedance:4Ω operatingSpeaker:6" Frequency Range: 50Hz-12KHz Voltage:6pcs 7# 1 ... Alkaline batteriesOperating Temperature:-10°cCharge Time:6-8 hoursOperating time: 4-6 hoursApplication:Teaching, assembly, Conference, Church, Parade, Lecture, Auction, Sale ...