our Alarm appliance is of high qulity , and it also enjoyed by the majority. it contains many types :(1) easy-carrying  EP200-1  / EP200-2   Tester

                        (2) tyne type           EP100  gas Tester


                         (3)family-used   TON90G   Stand-alone Combustible Gas Detector
                                                       TON90G    Single type of toxic gas detector probe set