Power Functions is a TECHNIC electric building system that consists of remote control units, power units, motors, lights and receivers that can be connected by cables with brick-shaped connectors. The core battery boxes deliver the power to different types of motors to make things move, light, remote control and even connection to a computer. Everything fits together in a system to let you build and control LEGO sets and inventions. The system was released in 2007
Accessories consists of 16 sets that ran from 2008 to 2018. As of today,
8878 Rechargeable Battery Box is the most valuable Accessories set with an estimated new/factory sealed value of $151.
Summary
Power Functions Accessories Transformer 10V DC set 8887 was released on April 2, 2009, retailing for $30, it has since been retired. New, unopened sets are valued at $40, while used sets sell around $25.
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