Model: Zebra ZD421tArticle number: ZD4A042-30EW02EZPrinting technology: Thermal transferResolution: 203 dpi (8 dots/mm)Max print width: 104 mmMax media width: 112 mmMax roll diameter: 127 mmPrint speed: Up to 152 mm/sConnections: USB, USB Host, Wi-Fi (802.11ac), BluetoothMemory: 256 MB RAM, 512 MB FlashSensors: Black Mark Sensor, Gap SensorFeatures