· Single Electronics Adjust Fm Radio

· Frequency range 88MHZ-108MHZ

· SINAD 56dB; THD <3%

· Opration voltage 2.1-3.3V; Opration current <15MA

· Can put in and out inner earphone also can ext.earphone in any time.if you want change the sunglaes funcation

· Easily to change Li battery (AG13), low energy to useing.the battery can continual min.15 hrs.