Remote annunciator with piezo alarm Specifications: APA151 Operating Temperature Range: 0°C to 49°C (32°F to 120°F) Operating Humidity Range: 10 to 93% non-condensing Dimensions: 4.6 in H x 2.9 in W x .45 in D Voltage Range: 16 to 33 VDC Alarm Current: max 30 mA