A bicycle wheel hub assembly having a number of light emitting diodes that are powered by rotation of the wheel during use of the bicycle. A CR BS detects an interference-free and unused frequency band. Once the battery has adequate charge to assist the external, power-limited source in powering the portable electronic device, the power-intensive operation can be performed. A composite insulated concrete form and a method of using the insulated concrete form are also disclosed. A common line supplies a common voltage. Upon the cam ring and the follower ring being engaged with each other in an assembly process thereof, an inner cam follower of the pair of cam followers first approaches an end of the cam rib in a lengthwise direction thereof, and an outer cam follower of the pair of cam followers subsequently approaches the same end of the cam rib.