The Bob the Builder Interactive Construction Play Set is a modular play centre complete with an innovative electronic recognition system The play set detects when any of the supplied Machine Team vehicles move forwards or backwards & sounds a beep or one of several character phrases relating to the moving vehicle Tumbler we need another load of cement The play set even knows when features such as the lift crane & cement silo are being moved & responds with appropriate sounds or phrases lift going up With barriers that can be raised or lowered to control vehicle access the set can be constructed in as many ways as little ones imaginations will allow