Usage time of 6-9 hours when fully charged.Long battery life.Large battery capacity.Loud and clear sound. FEATURE OF FUNCTION FOR SYSTEM:*7”high definition LCD display , used advanced double surface SMT circuit to make the performance perfect *DVD player , can play DVD,DVCD,SVCD, VCD,CD,MP3,MP4 disc*USB Connecror , can be insertde flash memory card, MP3 , MP4*High fidelity cassette player , high ...