Display
Featuring a CSTN display with 65K colors, the Bird S663 has a modest 1.5-inch screen. Its resolution is 128 x 128 pixels, giving it a pixel density of around 121 ppi. While the screen-to-body ratio is just 15.7%, it adequately supported the device's basic functionality, such as viewing text messages and navigating the simple menus. For those accustomed to modern smartphones, this display can seem quite limiting, yet during its release, it was sufficient for everyday use.