Model Number: WH-M07 portable thermal printer Brand Name: WH,Brightek Key Specifications/Special Features: WH-M07See table below: ItemSpecificationPrintingmethod Directthermallineprinting Paperoutdetection PEsensors Paperloadingway Easypaperloading Paper width 57mm Resolutionratio 8dots/mm(384dots/line) Lifeofprinthead 50km Printspeed 60mm/sec Charger InputAC100-240V,1.0A, outputDC8.4V,1.2A Battery DC7.4V (8.4V-6.8V),1300mAh Charging time 2hours Outlinedimensions 80mm*46mm*123mm Papersupplied Thermal paperroll(57mmwidth,40mmdiameter) Interface SerialRS-232C/USB/Bluetooth/IC Temperature Printer: 10-50°C (14-122°F) Temperature Battery: 0-40°C (32-104°F) Humidity Printer: 10-80% RH Humidity Battery: 10-90% RH Massstorage 8G SD