Honeywell Multi-Criteria Fire Sensor Model / Part No :- TC850E1009 Operating Voltage Range : 15 to 32 VDC Max. Standby Current :- 200 µA @ 24 VDC (no communication) Max. Avg. Standby Current :- 300 µA (one communication every 5 sec. with LED blink enabled) Max. Alarm Current (LED on) :- 7 mA @ 24 VDC Operating Humidity Range :- 15% to 90% Relative Humidity, non-condensing Temperature Range :- 20°C to 55°C Nominal Activation Temperature :- 60°C Compatible Detector Bases :- B501, B501DG, B524IEFT-1, B524HTR, B524RTE.