1.Rechargeable Lithium Battery 2.Voice Range:600sqm 3.16hours working time 4.CE Approval 5.Rated power up to 12W A-8310FU Portable Voice Amplifier:1.100% Factory direct sale,competitive price2.Best Service3.Durable ABS construction 4.Built-in 3 inch high power speaker,high sensitivity microphone5.Function:Talk,MP3 and FM,we also get it with USB and TF6.Application:For indoor/outdoor use7.Built-in ...