[en] A research of 'remote controlled engineering vehicle system for CBRN threat' was triggered by the nuclear accident that successively happened after the Great East Japan Earthquake occurred. This project focuses on the remote controlled engineering system that can be used for multi purposes such as debris/obstacle clearing operation or various reconnaissance operation, under CBRN threat. In this report, we describe performance tests for remote-controlled Relay-units, as part of 'remote controlled engineering vehicle system for CBRN threat'. As a result of a series of tests, it is proved that Relay-units are operable by remote-maneuvering regardless of day or night, and they possess communication recovery function. (author)