The Vershoven A24OBL (manufacturer's part number 01.31000) is a weatherproof special telephone and line selector, specifically designed for use in industrial or outdoor environments. It enables connection to up to ten separate telephone lines, with individual lines selectable via an integrated dialer. The device is equipped with an integrated ringtone generator that produces a piezo ringtone with a sound level of 60 to 90 dB(A) at a distance of one meter. Power supply is provided by four alkaline batteries of type LR14 (baby cell, 1.5 V), housed within the device. Battery monitoring informs the user of the charge status, and a power-saving mode reduces energy consumption during standby operation. The ringtone volume is adjustable via a volume control. The enclosure is made of polyamide and designed for outdoor use.

Applications
The Vershoven A24OBL is suitable for industrial facilities, production halls, warehouses, construction sites, or other environments where a robust, weatherproof telephone connection is required. The IP66 protection rating ensures protection against dust and water jets from any angle, enabling use outdoors or in damp indoor areas. The operating temperature ranges from −20 °C to +55 °C, and the storage temperature from −40 °C to +70 °C, ensuring the device remains functional even under extreme climatic conditions. The maximum relative humidity is 95 %, allowing high tolerance to humid environments.

Functions and Features in Detail
The device features an integrated ringtone generator operating on sinusoidal alternating current at 42 V and 50 Hz. The piezo ringtone is loud enough to be heard in industrial environments and can be adjusted via the volume control. Battery monitoring ensures the user is informed of the charge status to avoid communication interruptions. The power-saving mode reduces energy consumption when the device is not in active use. The spiral cord for the handset allows flexible use without excessive strain on the cable.

Technology Explained Simply
The IP66 protection rating means the device is dust-tight and protected against water jets from any direction — making it suitable for outdoor use or damp indoor environments. The operating voltage is supplied by four alkaline batteries (LR14) integrated into the device. The ringtone volume is adjustable to optimize audibility depending on the environment. The integrated battery monitoring displays the charge status to prevent unexpected shutdowns. The power-saving mode ensures more efficient use of battery capacity.

Compatibility and Accessories
The Vershoven A24OBL is designed as a line selector and can connect up to ten separate telephone lines (Lb1 to Lb10), as well as a main connection (La) and an additional connection (W2). The connections are intended for integration into existing telephone systems or industrial communication systems. The device comes with a spiral cord for the handset, enabling flexible use. No specific accessories are mentioned in the sources, but replacement batteries (alkaline LR14) are required to maintain functionality.

Mounting and Installation
The device is wall-mounted, with a mounting hole spacing between 128 and 134 mm. Installation is done via the pre-drilled holes in the enclosure. Dimensions are 221 mm (height) × 154 mm (width) × 105 mm (depth), making it compact and space-saving to install. The weight is approximately 1.5 kg, requiring stable mounting to ensure secure installation.

Operational Advantages
The Vershoven A24OBL provides reliable communication in demanding environments. Its weatherproof design (IP66) and high temperature stability (−20 °C to +55 °C operating range) allow use under extreme conditions. Integrated battery monitoring and power-saving mode ensure efficient energy use. The adjustable volume and piezo ringtone guarantee good audibility of the ring signal. Connecting up to ten lines via a line selector offers flexibility in communication within complex facilities.