A fishing bait delivery system is disclosed. Each touch sensing unit comprises: a differential signal source for generating two signals which have a same frequency but reverse phases; and two sensors for receiving a touch signal of a user’s finger. A second package substantially impermeable to oxygen is supplied. In a particular example, the personalized record is recorded on a digital media such as a compact disc or digital video disk or the like. In the preferred embodiment, each transceiver is capable of receiving and retransmitting signals of other sensor modules to relay signals of a particular sensor module in a daisy chain fashion to and from the central monitoring system. The second region of the sacrificial layer is contacted, by way of the second trench, with a chemical etching solution adapted to etch the sacrificial layer, said etching solution being selective to the first material.