fire alarm battery backup

Wanlin Fire - China source manufacturer for Thailand government fire alarm procurement. Featured model WL-TH-PNL (Fire Alarm Control Panel): Conventional panel, 4 zones x 20 detectors; Zone threshold programmable 3-15 mA per zone; 2 sounder circuits 24V 1A each + fire relay volt-free contact; 0 to +50 deg C, 10-93% RH. Full lineup: smoke and heat detectors, ···