GM811-L lens reading distance is 7-50cm.(The actual data depends on the size and content of the code)GM811 series bar code reader module is a high performance scanner can read 1D bar code easily and read 2D bar code with high speed. It also high speed for linear code even for bar code on paper or screen.GM811 series bar code reader module is an advanced bar code decoding algorithm which developed on recognition algorithm can easily and accurately read bar code simplify secondary development.Sensor:CMOS Mode:640*480Lighting:White LEDPower On:Green LEDIndicatorLight:Blue LEDRead Code Type1D: -13 -8 UPC-A UPC-EISSN CodaBar,Code 128,Code93 ITF-14 ITF-6 Interleaved 2 of 5,Industrial2of5,Matrix2of5 Code 39,Code11 -Plessey,GS1 Composite,GS1-Databar (RSS)2D: QRCode DataMatrix PDF417GM811-LReading Distance:7-50cm*: 25% **:Roll:360Pitch:65Yaw:65Viewing :67(Horizontal)53(Vertical)Accuracy of reading*: 10milMechanical/electrical Parameters:Interface:TTL-232/USBSize(mm):50x50 mmWeight:68gPrompting mode:Buzzer LED IndicatorOperatingVoltage:5VOperation Current: less than 70mAContinuous Reading Current: less than 120mAStandby Current: less than 6mA(Typical)Startup time: less than 250mS (Typical)Environmental Parameters:Operatingtemperature:-20~+60Storage Temperature:-40~+70Operating Humidity:5%~95%(Non-Condensing)Environmental Light:Normal indoor :Withstand 1.2 m drop on concrete floor (50 1.2 m drop on concrete floor repeatedly)type:DColour:As ShownMaterial:MetalPackage Contents:1 x Scanner ModuleOnly the above package content other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.