Adopted by the National Institute of Justice (NIJ) as NIJ Standard 0219.00, the equipment standard is a technical document consisting of performance and other requirements and test methods. Purchasers can use test methods described in the standard to determine whether a particular equipment item meets the standard's requirements or they can have tests conducted on their behalf by a qualified testing laboratory. Law enforcement personnel can also reference the standard in purchase documents and require that any equipment offered for purchase meet the standard's requirements and that compliance be guaranteed by the vendor or attested to by an independent testing laboratory. The necessarily technical nature of the NIJ standard and its special focus as a procurement aid make it of limited use to those who need general guidance on continuous, signal-controlled selective signaling equipment. The main purpose of the standard is to establish performance requirements and test methods for continuous, signal-controlled selective signaling in transceivers used by law enforcement agencies. Performance requirements are specified for minimum performance, user information, test sequence, environmental characteristics, modulation code frequencies, radio receiver/decoder characteristics, and radio transmitter/encoder characteristics. 11 references, 2 tables, and 15 figures