±5V~±15V electrical signal. Build in 12V7AH lithium battery, when blackout can continue to work. Voltage input: AC100-240V, 50/60Hz Voltage output: 13.5VDC Momentary current:5A, Persistent current: 3.5A Working temperature: -20℃~60C℃ Working humidity: ≤90%RH Dimension: 194mm*87mm*44mm