4-inch stainless steel electric doorbell, internal spark-proof bell type, 220V 10W, for audible signals and alarms in large public places--

【Material】The bell hammer is of high quality and the bell's sound is graceful. It is safe to use in all weather conditions, making it ideal for year-round use.【Easy to Install】The easy-to-install button adheres well to any surface, or use the screws to fix the button to the door frame. Simply plug it in and you're ready to go; it can be easily installed anywhere.【Material】The bell hammer is of high quality and the bell's sound is graceful. It is safe to use in all weather conditions, making it ideal for year-round use. [Loud Volume] Suitable as a sound signal and alarm in factories, schools, railways, and indoor public spaces; you won't miss any visitors, even if you are in several rooms. [Internal Percussion] The electric bell is a spark-free, internal striking type. If you have any questions, please email us with your order number and your questions. Note: All data is measured manually, please allow an error of 1-3cm due to manual measurement. Due to differences in light and display, there may be some difference in color, depending on the physical object received.