The CDL-02POWER is a type A male to type A female extension cable with only the + and - power pins connected. This is extension for charging devices like ipods, iphones, Sat Navs etc. It allows you co more→nnect the appropriate device cable and charge the device through your USB port on your PC/Laptop with out opening up your webstore, itunes etc. While a device cable has data and power only the power from the extension is carried through. Please note that due to limitations of 500ma output from a USB port, some devices may take longer than others to charge.