The present invention provides a vehicle room light apparatus which is small in size and achieves high heat dissipation. The detector includes technology for determining the location of the detector, and comparing this location to the locations of known stationary sources, to improve the handling of such detections. The top and bottom portions have a surface and continuous walls extending from the surface. The intermediate guide member, the outer step, and the receptacle each allow the respective upper slide member to move further toward the base. This memory device is can store data internally using any random access storage technology including PRAM, MRAM, RRAM, FRAM, OTP-RAM and 3-D memory.