Model Number:Yunxwdn26t17vqgu-01 Item Weight:350 g Features: Pure copper electromagnetic coil with discontinuity and no electromagnetic interference. Strong tapping, stable operation and long service life. Hard metal shell, not easy to deform, the sound reaches 100db, and it is farther and safer. The surface is coated with electroplating technology to make the material more anti-corrosive and less prone to rust and corrosion. Portable wired power supply, easy to install, can be installed on the wall, ceiling and other installation methods. Choose 12V / 24V / 220V according to the voltage you use. Specifications: Condition: Brand Color: Red Material: Metal Size: 4 inches(100mm) Power Mode: External Optional Voltage: 220V/12V/24V Alarm Volume: 100db Surface Treatment: Electroplating Package List: 1 * Fire Alarm Bell No electromagnetic interference: Pure copper electromagnetic coil with discontinuity and no electromagnetic interference Strong and sturdy: Strong tapping, stable operation and long service life Farther and stronger sound: Hard metal shell, not easy to deform, the sound reaches 100db, and it is farther and safer Anti-corrosive and corrosion resistant: The surface is coated with electroplating technology to make the material more anti-corrosive and less prone to rust and corrosion Portable wired power supply: Easy to install, can be installed on the wall, ceiling and other installation methods No electromagnetic interference Strong and sturdy Farther and stronger sound Anti-corrosive and corrosion resistant Portable wired power supply