A method and system for facilitating the purchase of goods and services anonymously from an e-commerce website is provided. A receiving device and a sending device may be in communication over a network. Uni-directional coupling is used for coupling and mixing the multi-channel outputs and transferring the mixed outputs to a data bus. The resonance part vibrates in radial extension mode with a center of the piezoelectric thin film used as a node, the piezoelectric thin film of two resonance parts is polarized in a direction perpendicular to a film surface, and a width of the connection part is one-fourth or less of a width of two resonance parts. The first tank is used for end-of-life maneuvers. The insert contains a frame that forms at least one chamber and has a fixing device located on one side of the frame for fixing the insert to the door storage compartment.