Working principle of alarm: After wiring, siren standby, you can turn ON/OFF the alarm freely by the remote controller. The remote range: 500m/0.3mile(no wall). Notes: the remote controller is powered by 9V battery(not included, need to purchase separately) and does not contain button or coin battery
Volume & Tones optional: The volume and tones can be changed by the side buttons(0-130dB adjustable, 12 kinds of alarm tone optional.) There is also USB port available. You can upload your own audio
IP65 waterproof: The shell is made of waterproof and dustproof steel plate. And the protection level is IP65, which can be used outdoors or indoor with confidence
LED Siren Light: right LED beads with low power consumption and long service life. Also it is designed with diffuser, can spread the light even in a dim environment
Widely used: Wireless emergency siren are widely used in factory, warehouse, businesse, school, mine, etc