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 to check if the charging is right for both mobile phone and pad. it also included for and for recognize resistor, it can change with 2.4A current. By testing, it can charge for 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 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 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: Material: ABS Package Contents: 1 x 19.05mm Distance Banana Plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.