As a weatherproof telephone, it is fully contained within a corrosion resistant cast aluminium weatherproof case with a door providing complete protection against dust and moisture ingress, resulting in a highly reliable product with a long MTBF. Equiped with hron and beacon, the hron can broadcast remotely for notification, hron works after 1-9 rings (adjustable), shut when handset lifted or call finished. Hron works after 1-9 rings, shut when handset lifted or call finished. The LED Red beacon begins to flash when ringing or in use, attracting attention to the phone when call comes, it could be very useful in the noisy environments. Ideal for Metro, Railway, Highway side, Marine, Mining, Tunnels, Steel Plant,Chemical plant,Power plant and related industrial application, etc.