The Kingfisher KI021 talk sets are used during installation and maintenance of fiber optic transmission systems, they provide superb performance and convenience. Talk sets are typically used where alternative communications may be impossible, unreliable, inconvenient or expensive. They typically save time and help make field operations more efficient and predictable. The talk sets can be easily used by semi-skilled staff. One model is suitable for all general singlemode and multimode applications. Reliable field operation is guaranteed by a unique combination of features such as very simple to operate controls, rugged drop protected construction and reliable analogue transmission. High quality voice transmission is maintained over the full optical range, with no operator intervention.