Epson Portable Receipt Printer (TM-P20-BT) - Dot density: 203 DPI x 203 DPI, Print method: Thermal line printing, Print Speed: 100 mm/sec, Paper Types: Receipt, Data Buffer: 128 Bytes, Interfaces: USB 2.0 Type Mini-B, Bluetooth, Battery Life: Bluetooth 26 hours, Reliability: 16,000,000 MCBF (Lines), 120,000 MTBF (Hours)