... + 1dbConsumption Current: 150mAVoltage: DC 7.5, li-ion batteryBattery Type: Lithium BatterySize:105x55x140 mmThe amplifier speaker is engineered for enriched ... echo4,with LCD digital screen,size:30x22 mm5,with the function: calendar,alarm clock,showing song lyric,etc.6,with ... ,Battery life can reach 2-3 yearsCooperate with wearing type microphoneAmplification effect is goodEasy to use, can make MP3 ...