GM811-S lens reading distance is 5-30cm.(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 wins high scan 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 image recognition algorithm, can easily and accurately read bar code, simplify secondary development. Sensor: CMOS Scan Mode: 640 x 480 Lighting: White LED Power On: Green LED IndicatorLight: Blue LED Read Code Type 1D: EAN-13, EAN-8, UPC-A, UPC-EISSN, ISBN, CodaBar,Code 128, Code93, ITF-14, ITF-6, Interleaved 2 of 5,Industrial2of5, Matrix2of5, Code 39,Code11, MSI-Plessey, GS1 Composite,GS1-Databar (RSS) 2D: QRCode, DataMatrix, PDF417 GM811-S Reading Distance: 5-30cm Contrast x : Greater than 25% Scan Angle x x : Roll: 360°Pitch: 65°Yaw: 65° Viewing Angle: 67°(Horizontal)53°(Vertical) Accuracy of reading x : greater than equal 10mil Mechanical/electrical Parameters: Interface: TTL-232/USB Size(mm): 50x50 mm Weight: 204g Prompting mode: Buzzer LED Indicator OperatingVoltage: 5V Operation Current: less than equal 70mA Continuous Reading Peak Current: less than equal 120mA Standby Current: less than equal 6mA(Typical) Startup time: less than equal 250mS (Typical) Environmental Parameters: Operatingtemperature: -20℃~+60℃ Storage Temperature: -40℃~+70℃ Operating Humidity: 5%~95%(Non-Condensing) Environmental Light: Normal indoor light source Fall: Withstand 1.2 m drop on concrete floor (50 times 1.2 m drop on concrete floor repeatedly) type: A Colour: As Shown Material: Metal Package Contents: 3 x Scanner Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3