This Bell 80D from BT, is suitable for external use in noisy environments where loud ringing is required. Can be wired into standard BT telephone sockets. Ideal for outdoor noisy areas such as workshops warehouses etc. where the telephone ring needs to be at a high volume in order to be heard

105dB sound output
Screw terminal connection
4kΩ bell actuator for parallel connection
Grey die cast case
REN 1
Package Dimensions: 152x252x252mm

Telephone lines usually have a REN of 4, they can operate up to four telephone products (e.g., phones, fax, answering machine) each with a REN of 1
Specialist installation recommended.