Operating voltage: 5V
Rated impedance: 4 Ohm
Frequency response: 100 Hz-18KHz
Max power output: 3W*2                       
S/N:>=80db              
sensitivity:400mv            
Built in li-battery                        
Support TF Card and iphone/ipod          
Material: ABS
N.Weight:407g                                       
with remote control

Product Size(cm): 10*7.6
Carton Size(cm)  :65*33*21cm/20pcs