Product Size:85(W)*88(L)*85(H)mm Sound:1 or 6 Tone Magnet:Ferrite Power:15/20/25W Impedance:4/6/8/12 Ohm Rated Voltage:DC12/24V Working Voltage:DC6-15/18-28V Rated Current:550/700/1200 mA SPL:110/115/120 dB Plastic Material:ABS Colour:Black/White Packing:40pcs/CTN