Model Number: WH-M08 Wi-Fi Brand Name: WH,Brightek Key Specifications/Special Features: Please see table below ItemsSpecifications Printingmethods Directthermallineprinting Paperoutdetection PEsensors Paperloadingway Easypaperloading Paper width 80mm Resolutionratio 8dots/mm(576dots/line) Lifeofprinthead 50km Printspeed 60mm/sec Charger Input 100-240V AC,1.0A, output 8.4V DC,1.2A Battery 7.4V DC(8.4-6.8V),1600mAh Charging time 2hours Outlinedimensions 100*46*123mm Papersupplied Thermal paperroll(80mmwidth,40mmdiameter) Interface SerialRS-232C/USB/Bluetooth/Wi-Fi Temperature Printer: 10 to 50°C (14to122°F) Temperature Battery: 0to40°C (32to104°F) Humidity Printer: 10-80% RH Humidity Battery: 10-90% RH Massstorage 8G SD