GM802-L lens reading distance is 7-50cm.(The actual data depends on the size and content of the code)GM802 serial 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.GM802 serial 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.Parameter PerformanceSensor CMOS Mode 640 x 480Lighting It is recommended to use white light as lighting, should be uniform and softIndicator Light It is recommended to use green/blue light as read successfullyRead Code Type 1D: -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, PDF417 25% Roll:360Pitch:65Yaw:65Viewing 67(Horizontal)53(Vertical)Accuracy of reading x 10milParameter PerformanceInterface TTL-232/USBSize(mm) 18 x 12.5mmWeight 1gPrompting mode Buzzer LED IndicatorOperatingVoltage 3.3VOperation Current 70mA(Max)Standby Current 6mA(Typical)Startup time 250mS (Typical)Environmental Parameters:Parameter PerformanceOperatingtemperature -20~60Storage Temperature -40~+100Operating 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)Colour: BlackMaterial: pcbPackage Contents:1 x DC3.3V Scanner ModuleOnly the above package content, other are not included.Note: Light 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.