Simplex 4098-9780 Supervised Relay BaseSimplex 4098 9780 Supervised Relay Base is a 2 wire plug in sensor base, use with remote or locally mounted 4098 9860 relay, no separate power required. Designed for use with TrueAlarm Analog Sensors. Supervised relay operation is programmable and can be manually operated from control unit. Includes wired connections for remote LED alarm indicator or 4098 9822 relay (relay is unsupervised and requires separate 24 VDC). Designed for use with: 4007ES,