... battery housing.1, automatic tracking frequency functions. 2. failure to automatically detect and display. 3, five-step adjustable amplitude without ... points of both working pieces is nearly equivalent which helps to form a uniform weld area. The welded area is ... lead-acid batteries, 3-inch floppy disk, U disk, SD card, CF card, USB connectors,Bluetooth. Toys,stationery: folder, album, folding boxes ...