Supply voltage: 9 V DC Sensor type: photoelectric sensor Power Type: Battery (1 x 6F22 9V) Alarm Current: 20-50mA Recommended installation location: ceiling or wall Sound level: 85 dB Flash alarm indicator: red Test button: Yes Low battery indication: Yes Temperature range of sensor operation: 0C ~ + 50C Dimensions: 110 x 28 mm Packaging type: Color box