... . Type:waistband amplifier/Mini speakerSpecitification:Operating Temperature: -10~+50°CUsed for full time 4 ~ 6 hours ... ,TFcard,FM audio,LED displaylibretto synchronizer,Reverberation effect,with remote controlOutput power: 25WBattery:Lithium batteryWeight: 20KG ... speaker is widely used at home, office , school , church , factory , hospital ,meeting , restaurant ,etc . Mini portable mp3 pa speaker ...