Comparison : Item # WMX045-4000, 4.5 Volts (V) Output Voltage (DC) and Positive Polarity Center Interchangeable Input Plug Wall Plug-In Switch Mode Power Supply
Item # WMX045-4000-13, 4.5 Volts (V) Output Voltage (DC) and Positive Polarity Center Interchangeable Input Plug Wall Plug-In Switch Mode Power Supply
Item # WMX045-4000-R, 4.5 Volts (V) Output Voltage (DC) and Negative Polarity Center Interchangeable Input Plug Wall Plug-In Switch Mode Power Supply
Item # WMX045-4000-R13, 4.5 Volts (V) Output Voltage (DC) and Negative Polarity Center Interchangeable Input Plug Wall Plug-In Switch Mode Power Supply
Item # WMX050-4000, 5 Volts (V) Output Voltage (DC) and Positive Polarity Center Interchangeable Input Plug Wall Plug-In Switch Mode Power Supply