Design and Build
Measuring 84 x 47 x 17 mm and weighing just 84 grams, the Panasonic X400's compact size and lightweight build made it highly portable, fitting easily into pockets and small bags. Its signature feature was the "One push auto open" mechanism that added a touch of flair to its clamshell design. Available in classic Black, Red, and White colors, it appealed aesthetically to a variety of users looking for simplicity and style. The use of a Mini-SIM card was standard for phones of this era, helping it fit into existing infrastructures without the need for adaptation.