Zebra ZD421C, Thermal transfer, 300 x 300 DPI, 102 mm/sec, Wired & Wireless, Black, Grey Zebra ZD421C. Print technology: Thermal transfer, Maximum resolution: 300 x 300 DPI, Print speed: 102 mm/sec. Connectivity technology: Wired & Wireless, Wi-Fi, Bluetooth, Bluetooth version: 5.3, USB port. Product colour: Black, Grey