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ANRUI is a Registered Trademark. Trademark Registration Number is 87062317. We has enrolled Amazon Brand Registry.All of our products have their GCID number. All ANRUI product are sold exclusively by ANRUI direct. We don't authorize other sellers to sell ANRUI product.Specification: VOL: 120dbwaterproof level:IP66Material: Environmental ABSVolt: 12VWorking current: 220mAProduct size: 2.4*1.9*0.67inch Note: 1. When the alarm sound goes low, please remove screws from back cover and replace new batteries. 2. If you have any questions, please feel free to contact us, our customer service will be more than happy to assist you.