Featuresr a dual purpose machine can be a powerful horn or a careful warning alarmr loud alarm up to 110 decibelr one key control through a wire connects a key and the alarmr surveillance control password can be set to avoid being stole and increase security surveillance safe and reliabler vibration alarm enhance the sound power and security surveillance r password is changeable according to user manual so that the alarm can be more reliabler rain resistance splash resistancer powe