1、Low-noise direct thermal printing method; fast printing speed. 2、Support max. 40mm (diameter) paper roll, around 16-20 meter; serial interface (RS-232C,TTL) and USB interface. 3、Rich of grasphics / curves / characters print function. 4、Easy paper loading structure. 5、Support 5V-9V wide power voltage. 6、BT module is reserved, which provides more possibilities. Features: Low-noise direct thermal printing method; fast printing speed. Support max. 40mm (diameter) paper roll, around 16-20 meter; serial interface (RS-232C,TTL) and USB interface. Rich of grasphics / curves / characters print function. Easy paper loading structure. Support 5V-9V wide power voltage. BT module is reserved, which provides more possibilities. Specifications: Print Method: thermal direct line printing Paper Loading Method: easy paper loading Paper Width: 57mm Print Width: 48mm Resolution Ration: 8 dots/mm (384 dots/line) Life of Printing Head: 50km Printing Speed: 50mm/sec.; max.: 80mm/sec. (voltage 8.5V) Character Size: ANK: 9*17, 12*24; GBK: 24*24 Chinese Character Fonts: GB18030: 12*24 or 24*24dots Outline Dimension (W*D*H): 76.8 * 77.4 * 47.6mm Installation (W*D): 72.8 * 73.4mm Embedded Depth: 34.65mm Paper Roll Specification: width: 58mm, max. diameter: 40mm Interface: serial (RS232, TTL), USB Baud Rate: 9600 Input Power: DC5-9V, 2A Operation Temperature:  0°C~55°C Storage Temperature: -25°C~70°C Operating Humidity: 10°C~80°C Storage Humidity: 10°C~90°C Package Size: 12 * 8 * 5cm / 4.72 * 3.15 * 1.97cm Package Weight: 120g / 4.23oz Package List: 1 * printer module 1 * serial line 1 * power line 1 * thermal paper roll 1 * printer module 1 * serial line 1 * power line 1 * thermal paper roll