Main function of this system: 1) Record and play,teacher's speaking,FM/tone frequency sending,broadcast receivingand teaching material edition. 2) 100 sending frequency bands available,for adopting the technique of frequencycomposition locking. 3) Quiescing methods of SP,SPSP,SSP,SSPS 4) 1-10 times of repetition of sentences or A-B sector. 5) Preset more than 5" bookmarks" for quiescing frequency band memory and fastsearching. producing area:China payment:T/T in advance supplying capacity:50 sets/month