This 5watt photovoltaic panel mounts easily to the Symphonie NRG Logger shelter box and provides a continuous source of power for the iPack internal rechargeable gell cell batteries. This rugged panel was designed for charging 12V battery systems and is able to deliver battery-charge power levels in low-light situations. The panel also has a built in blocking diode and a 9.5 foot UV resistant cable. Includes mounting hardware.