memory card headphone
Features:
◆ As MP3 SD card headphone  
◆ As FM radio                 
◆ As Multimedia computer headphone 

Specifications:
Support file format:MP3          
SD/TF cards supportive          
Power supply:3.7V 500mAH LI-ION battery)                         
Static state eletric current less than 40uA                      
Charging use computer USB port             
Sampling rate:(Bit rate)32/44.1/48KHz                      
S/N Rate:About 70dB(1KHZ)     
Driver unit:40mm                         
Output power:10mW                
FM frequency response: 87.5MHz-108MHz        
Battery life(full): 15 hours