Features: Featuring a 1.54inch 4color (red, yellow, black, white) e link display, this energy efficient screen delivers vibrantly visuals and wireless content updates via smartphone compatibility. The high resolution PC built e paper panel combines clear text/graphics for seamlessly data sharing, contactless payments, and multidevice synchronization. Ideal for students, office professional, and travelers seeking compact solution for dynamic code displays, digital business cards, or personalize accessory customization. Effortlessly showcase contact detail, payment links, or event schedules in classrooms, conferences, or transit hubs via its portable keychain ready design. Engineered with near 0 power consumption during statics image retention, this durability e link device operates for extended periods without frequent recharging, perfect for real time information sharing. Specifications: Component: PC Size:Approx.47.84x41.28x6.34mm/1.88x1.62x0.24inch Grayscale 2level Display color: red, yellow, black, white. Refreshing time: 15s (excluding data transmission time). Point spacing: 0.135x0.135 Viewable angles: >170°. Resolution: 200x200. Display size: 27x27mm Package Includes: 1pc Display Screen 1pc Lanyard note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.