A pet shovel has an elongated handle, a shovel head and a bag mounting frame disposed between the shovel head and a distal end of the elongated handle. These systems break down a sound field into sound events and non-sound events and separately localize the sound events and non-sound events. The locked-in condition is determined according to the ratio of the number of modules found to be greater than or smaller than the threshold to the total number of modules. The communication module is configured to be detachable from the base. Anisotropic etching is performed to remove part of the organic layer until the oxide layer on the first and the second gate structures is exposed, wherein a remaining organic layer is left above the substrate.