This Remote Relay Alarm Kit provides a means to interface the Extech SL130G Sound Level Monitor or the RH520A Humidity-Temperature Recorder to an external device to indicate when over limit condition occurs. Includes a 3A DC solid state relay, 9-Foot (3m) alarm relay trigger cable, nickel-plated screws and saddle clamps. 6 Months WarrantyCheck Distributor Stock