DL-560 Portable belt amplifier 1.Advantage:portable 2.Battery:6pcs 7# 1.2V Ni- ... 7# 1.5V Alkaline batteriesOperating Temperature:-10°cCharge Time:6-8 hoursOperating time: 4-6 hoursApplication:Teaching, assembly, Conference, Church, Parade ... , Sale promotion, tour guide, assembly,speech,etc.Our728 series PA amplifier can let your voice get louder and sounds more pretty ...