Portable e book reader – ButterFly BD

A compact magnetic e-ink reading accessory made by the brand XTENK. It’s designed to attach to the back of a smartphone, likely using a MagSafe-style magnetic system. The device looks like a small standalone e-ink reader / secondary display for reading text with lower eye strain and lower power consumption than a normal phone screen. It resembles a miniature e-reader that can magnetically stick to a phone. Key features highlighted in the Chinese text: Magnetic attachment design (“磁吸设计”) 219 PPI display with software optimization for clearer text (“219PPI 软件优化 字体清晰”) Low-power chip 650mAh battery About 10 hours of continuous reading Up to 7 days standby/light reading Physical page-turn buttons (“物理翻页按键，闭眼也不会错” — “physical page-turn buttons, easy to use even without looking”) The device shown appears to function like a compact e-ink display for reading notes, books, or text snippets while attached magnetically to a phone.