... Lithium BatterySize:105x55x140 mmThe amplifier speaker is engineered for enriched sound reproduction and has a highly steady operating distance. The ... This amplifier speaker is suitable for on-stage performance, teacher guide and so on. Function:1,with USB,TF,MP3 input2 ... :30x22 mm5,with the function: calendar,alarm clock,showing song lyric,etc.6,with remote control Features:The Rechargeable Voice ...