Product name:USB A port female 4P 4mm lantern type banana plug, the distance is 19.05mm between the banana plugs. Usage:This USB A port is used on DC power supply output port, the distance of the positive(+) and negative(-) port must be 19.05mm, besides, need set the DC power supply output voltage to 5V, get the USA A port positive and negative electrodes align with that of the DC power supply output port. then it can charge for mobile phone and pad, also can test if the charging current is right, it is easy for the repair engineer to check if the charging is right for both mobile phone and pad. it also included for Iphone and for Ipad recognize resistor, it can change Ipad with 2.4A current. By testing, it can charge for OPPO Mobile phone with 2A current. Note: 1. Must make sure the + and - on the USB A port is align with the DC power supply output port, can't get it reversed. 2. Make sure the DC power supply output voltage must be 5V, the current need to be a bit higher than the charging current to ensure the charging is working right. 3. The charging current is mainly depends on the recognition ability of the phone, the Max. charging current maybe only 1A for some mobile phone. Color: Purple Material: ABS Package Contents: 1 x 19.05mm Distance Banana Plug