The Numens 442-001 is a non-addressable audible alarm device designed for use in fire detection and alarm systems. It operates on a 24V DC supply and features a loud sounder output of 85 dB at 1 meter. The device is suitable for connection to both 2-wire and 4-wire systems, making it versatile for different alarm circuit setups. It is available with a red or white body. The alarm activates once the operating voltage is connected and does not consume current in its quiescent state, making it energy efficient and easy to install and maintain