banhao alarm horn siren pa speaker mic system, banhao 100w 12v 7 sound loud car alarm police car siren speaker system emergency amplifier kit for 12v truck lorry boat vehicle siren horn is up for auction in Automotive. The current bid is $22.50, 13% below the $25.95 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.