• Three Color Temperatures — Switch between 3000K (warm light), 4500K (neutral light), and 5500K (white light) to suit any reading environment.
• Stepless Brightness Adjustment — Long-press to fine-tune brightness from 8% to 100%.
• Brightness Memory — Automatically recalls your last brightness setting.
• Rechargeable via USB — Built-in 250mAh lithium-polymer battery; fully charges in about 40 minutes.
• Smart Indicator — Red LED lights up while charging and turns off when fully charged.
• Up to Hours of Reading — Battery life ranges from 3–15 hours, depending on brightness level.
• Multi-Use Design — Use it magnetically with your Xteink X4, or clip it to books, notebooks, or even your desk.