-Plug Diameter:3.5mm
-Plug Type:direct-emnedded
-Frequency Range:20-20000(HZ)
-Impedance:32Ω

*It can in airlines,trains,buses,boats,etc,Especial for hop on hop off,citysight seeing
*Certificate:CE&ROSH

FEATURE
1.Material ABS
2.Color Optional
3.Speaker 10mm
4.Sencitivity 953dB at 1000Hz
5.Rated Power 80mW
6.Maximum Power 100mW
7.Cable Length Appro 1.2m10%
8.Cable Diameter2.65mm
9.Weight Apprx. 12.5g