Welcome to our store! This 2.13-inch electronic ink screen uses new passive near-field communication technology, eliminating the need for a built-in battery and any battery life concerns. Supporting battery-free environmental protection, energy saving, and easy mobile app operation, this screen utilizes new passive near-field communication technology for wireless transmission. It features a beautiful and thin design with a high-quality ABS shell. For stable operation, this e-ink screen retains new passive near-field communication wireless brushing technology, using a passive near-field communication scheme that requires no built-in battery or cumbersome wiring. The e-ink screen installation is simple, and its quality is guaranteed. You can use it with confidence. When you need to update the screen, you can use near-field communication-enabled smartphones or card readers near this product to wirelessly power and update the screen content. Item Type: E-ink Screen Power Supply: Wireless Power Supply Grayscale: 2 Display Color: Black and White Refresh Time: 2s (excluding data transfer time) Pixel Pitch: 0.194 x 0.194 Screen Size: Approx. 49.7 x 21.75mm / 2 x 0.9in Resolution: 250 x122 Viewing Angle: >170° 1 x E-Ink Screen If you find any product problems after receiving the goods, such as damage or incorrect quantity of goods, please contact the seller immediately. We will do our best to provide you with satisfactory customer service.