A very small area CMOS image sensor, e. The detecting method includes determining, by D2D UE, a starting point of a time window for detecting discovery sequences, according to uplink transmission timing of an uplink between the D2D UE and an eNB of an LTE system and detecting discovery sequences of other D2D UEs by the D2D UE at the determined starting point of the time window. The sample-and-hold amplifier samples an analog input signal using clock boosting. The interface may be operatively connected to the memory and the processor and may communicate with mobile network operators. A sensor, which monitors the functionality of the receiving points along the transport line to detect defects, is connected to a control unit, which determines the feed of the printed products to the receiving points of the transport device.