Input: 110V/220V AC; Output: DC 24V 15A max. Output voltage is adjustable 5%. Three sets of output Channel. Safety features: Automatic overload cut-off, over Voltage cut-off, automatic thermal cut-off, short circuit protection. Voltage consistency: There is no voltage fluctuations to speak of at power on, during transmit, receive, or at power off. It comes with built-in cooling fan and temperature detector. Cooling fan will not run until the inner temperature reaches 113°F (45), which makes heat dissipation more efficient. Compact small size, high efficiency, high reliability and stable performance. Indoor use only!