According to one exemplary embodiment, a retail display accessory is provided for assisting a consumer in color coordinating a first article of clothing with a second article of clothing. The continuously variable speed-changing transmission mechanism can laminate a sheet article at a stepless variable speed. A monitoring section monitors an input level of each optical packet signal or each electrical signal and transmits a monitored value to the bias voltage supply section. The storage region includes a trench, which is preferably a Shallow Trench Isolation.