1.ISO9001 2.Length:450MM 3.Frequency:450HZ 4.Sound level:>110db 5.High quality +reasonable price Details: Rated Voltage: 12v , 24v, 12v&24v Running current: <4A Material: zincMin. Order Quantity50 Piece/PiecesFOB PriceUSD 6.3--6.8/ PiecePortShanghai/NingboPayment Terms30% deposit, 70% T/T before shipmentProduction Capacity3000 Piece/Pieces / MonthPackaging DetailsWhite packing,color packing,also ...