Brother Monochrome Laser Printer, HL-L5100DN, Duplex Two-Sided Printing, Ethernet Network Interface, Mobile Printing, Amazon Dash Replenishment Enabled FAST, HIGH-QUALITY PRINTING: The HLL5100DN delivers high-speed printing up to 42ppm with sharp resolution. FLEXIBLE CONNECTIVITY: Share this office printer with multiple users via a built-in Ethernet network interface or easily print from your mobile device(1). AUTOMATIC DUPLEX PRINTING: The Brother Monochrome Laser Printer has an automatic two-sided printing feature that can save paper and time. AMAZON DASH REPLENISHMENT ENABLED: Upon activation, Amazon Dash Replenishment measures the toner level and orders more from Amazon when its low. FOR USE WITH BROTHER GENUINE TONERS: TN820 Standard Yield Toner, TN850 High Yield Toner for cost efficient output