Part Number: Health Gear rx3ytsac7b-01 Package Dimensions: 12.9 x 12.7 x 6.4 cm; 360 Grams Size: 220V Batteries Required?: No Item Weight: 360 g Specification: 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 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: New 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 Easy to Install: Portable wired power supply, can be installed on the wall, ceiling, and other installation methods. Strong tapping, stable operation, and long service life. High Volume: The sound reaches 100dB, and it is farther and safer. Quality Material: The surface is coated with electroplating technology to make the material more anti-corrosive and less prone to rust and corrosion. Rugged And Durable: Our electric bell for door has a long service life. It uses hexagon socket screws to strengthen the welding, and the welding is stronger, which can provide you with a longer service. Household Or Commercial Doorbell: This electric bell uses a stainless steel impact plate surface, which has better anti-rust effect. This durable household doorbell makes it easier for visitors to announce their presence.