Portfolio Outdoor Landscape GLA-300 150 Watt X 2 Power Supply Black Low Voltage

When plugged in, the device does turn on, other than that, I have no idea how to test this product. Thanks! Portfolio Outdoor Landscape 150 Watt X 2 Power Pack Black Low Voltage Untested. Condition is "Used". Untested product, please judge condition based on pictures I have provided.