Fire-Lite B200S-LF-IV and B200S-LF-WH Low Frequency Intelligent, Programmable Sounder Base, The B200S-LF-WH and B200S-LF-IV sounder bases are used with addressable detector heads. Refer to the appropriate manual for more information on sensors. The B200S-LF-WH/B200S-LF-IV low frequency sounder base generates a low frequency tone around 520 Hz. The B200S-LF-WH/B200S-LF-IV offers maximum flexibility in configuration and operation to meet or exceed the requirements of UL268 and UL464 for Continuous, Temporal 3 and March time patterns. The temporal 4 pattern meets all requirements of UL268 and UL2075, as well as, private mode setting of UL 464. Main Features Base Diameter: 6.875" (17.46 cm) Base Height (less sensor): 2.0" (5.08 cm) External Supply Voltage: 16 to 33 VDC (VFWR) Standby Current: 550 µA maximum VDC SLC Operating Voltage: 15 to 32 VDC SLC Standby Current: 300 µA maximum (base only, refer to applicable sensor specification) The detector should be cleaned at least once a year. Available in Ivory and White