BRK SA520B WIRELESS BRIDGE UNIT AC/DC SMOKE DETECTOR
WRLSS AC/DC SMOKE ALARM
AC/DC Photo Wireless Interconnect - Bridge Unit SA520B
AC/DC Wireless/Hardwired Interconnect Photoelectric Smoke - 2-AA Battery Backup. This smoke can be used to bridge a wired interconnected system to a network of DC powered only devices (SA511B,CO511B & SCO500B)