A method being applied to manufacture a water-proof electronic device is disclosed in the present invention. When the interference exceeds an interference threshold, the access point provides a request packet to affiliated stations being serviced by the access point for channel spectrum information. The data read in the refreshing cycle is saved in a refreshing sense amplifier during the readwrite operation and stored in the memory cell after the readwrite operation. The key is encapsulated with mold compound to form a lock. In one embodiment, the receivers comprise a frame, a pressure vessel for housing the memory and remotely activated controls, and a geophone that is separately planted into the seabed at a relatively short distance from the frame.