... Free android test app,source code 2.interface:serial,IR,USB & bluetooth 3.Small size,easy to operate DESCRIPTION: Mobile thermal ... speeds up to 80 mm/s ; various interfaces; serial, IR, USB & bluetooth; long lasting li-ion battery ( 7.4V, 1500 mAh ), ... development of USB phone,gsm sms printer/gprs online printer,bluetooth printer,portable printer/mini receipt printer,GSM fixed wireless terminal,etc ...