In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. Metered Power Conditioner and Light Module. The SP 4x4 features a backlit linear meter to monitor input voltage, which gives the user a familiar analog style readout when monitoring voltage from a power source. The SP 4x4 also features ART's "4x4" distribution on the back of the unit - four of the eight rear outputs are 1.25 inches apart. This allows the user to plug in wide power cables and multiple wall wart devices, and still have eight total power outlets to choose from.