The key function.frequency a key cut over. pause/broadcast/the volume size/top and bottom selected songs/connect to hear/the secret hear/hang machine etc
Have the power failure memory function.Can remember power failure song/frequency/volume size broadcast
 Inside place the audio frequency exportation to connect, can connect headphones etc. the wiretap equipments
 Broadcast function automatically:Be broadcasting or pausing appearance to insert ＳＤ,The card or the Ｕ dish can enter an au to broadcast song
 The frequency adoption numeral shoot.Will not have any interference influence sound quality
 12 V Vs-24s breadth electric voltage power supply