the following example is for you reference.

^Features: 
Switching power supply using imported components, with low price, high reliability, small volume, light weight, high efficiency, etc. Working temperature is low, service life long, with high temperature burning 100% aging test machine. Wide range of input voltage, and conform to the global use of standard. with short circuit, overload, over-voltage protection function. so as the DC regulated power supply is widely used in surveillance cameras, LED lamps, LED luminous word advertisements. Computers, communications equipment, industrial control, home appliances, transportation, building, etc 
 
^{Technical details}: using imported components, high reliability. Built-in WMI filter, anti-interference performance is good. 
Small DC ripple and high efficiency. Design of soft start circuit, AC surge current limit. 
Low working temperature, long service life. Wide input voltage range, in accordance with applicable standards around the world. 
Insulation performance is good, high electric strength. with functions of short-circuit, overload, over voltage, protection.. 
 
^{Operation method of usage:}L, N for AC input (220 v), next to the ground; V + for the output voltage anode, COM (or - V) as the cathode; ADJ for adjustable potentiometer, fine-tuning the output DC voltage 
 
^{Warm prompt:}Power note 1, when determining the power output power, to consider the power shoulds not be long time continuously at full load working state, under the condition of continuous work for a long time, the use efficiency of switch power supply is 80%, the power to ensure the long-term use, please make room use. Otherwise there will be may cause premature failure of the human. 2, this product all wiring should tightly solid, should not be loose, so as to avoid damage of fever, switching power supply. 
 
^Package: the small white box independent packing, the big carton pack 120