100db High Decibel Fire Alarm Bell, 4 Inch Stainless Steel Internal Strike Type Electric Bell Compatible Fire Alarm, Emergency Evacuation About this product: Hard metal shell, not easy to decompatiblem, the sound reaches 100dB, the maximum range is 600-800 square meters, and it is farther and safer. Pure copper electromagnetic coil with discontinuity and no electromagnetic interference, strong grip, stable operation and long service life. The surface is coated with electroplating technology which makes the material more anti-corrosive and less prone to rust and corrosion. Wired portable power supply, easy to install, can be mounted on the wall, ceiling or other methods. Product Specifications: Condition: new. Colour: red. Material: Metal. Size: 4 inches (100mm). Power mode: external. Voltage: 220V. Alarm volume: 100db. Surface treatment: electroplating. Package list: 1 * Fire Alarm Buzzer. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!