Applicable smartphone models: Compatible with all NFC-enabled phones Features: The displayed photos can be easily interchanged Power supply method: Wireless NFC charging Resolution: 200x200 Pixel spacing: 0.138 x 0.138 Please note that Airtag is not included with this product and it is only suitable for phone models released after 2018. Display colors: Red, black, white Refresh rate: 8 seconds Viewing angle: Greater than 170 degrees External dimensions: 47.84mm x 41.28mm Display size: 27.00mm x 27.00mm Colors available: White Material: Plastic and metal Package contents: 1 * NFC Function Keyring Display Only the items listed above are included, other products are not. Note: The item's color may appear slightly different in photos due to light reflection and display variations. The allowed margin of error for measurements is +/- 1-3cm.