I found the following circuit in a solar garden light. The cut off white and black wires are from the solar panel. What does the 4 pin transistor do? 
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The "4 pin transistor" is an integrated circuit such as the QX5251, which combines battery charging, light sensing, and voltage boost circuitry in a single package.
answered May 29, 2016 at 17:02
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4\$\begingroup\$ Please not that it's not a 4 pin transistor - it's an IC in a package that looks similar to that of a typical transistor. \$\endgroup\$ Commented May 29, 2016 at 18:18