Input Voltage Range: 110Vac / 120Vac Input Frequency: 60Hz +/- 3 Hz Output Voltage: 6, 7.5, 9 or 12 Volts (On Battery) Surge Energy Rating: 360 Joules Features: Lightning/Surge Protection – 360 Joule protection from phone line surges and spikes - a leading cause of phone degradation and failure. Scalability - Works with all 6V, 7.5V, 9V & 12V cordless phones and answering machines. Emergency Light - Emergency utility light activates automatically during a power outage. On-Board Transformer - Built-in transformer replaces a bulky standard adapter. Avoid lost calls or missed messages during a power failure! Plug your cordless phone or answering machine into CyberPower's battery back-up unit and receive more than 4 hours of emergency back-up power. It has built in surge protection to prolong the life of your connected electro...