... the Li-poly charging current,voltage,temperature automatically. When charging in abnormal conditions,it will cut off the charging circuit itself ... than 3V.5,with battery capacity indication function in different capacities at 20%.40%,60%,80%&100%6,with FM transmit function ... /88.9/89.3MHz)7,with auto power off function in 60 seconds when there is no audio input.8,Data sync function ...