This wireless repeater is a microprocessor-controlled repeater designed to relay digital data between wireless SecureLinc transmitters and a target receiver. Up to 16 repeaters may be added along the communication path to extended the range of communication for your security system. Powered by 13-20VDC or 11-16VAC, this device features a unique anti-collision transmission sequence. A 9V battery (not included) provides backup in the event of a power failure. Available in several optional frequencies in compliance with international standards.