GM803 serial have GM803-S model. The only difference between GM803-S is the lens. GM803-S lens reading distance is 5-35cm. (The actual data depends on the size and content of the code) Parameter Performance Sensor: CMOS Scan Mode: 640x480 Lighting: It is recommended to use white light as lighting, should be uniform and soft Indicator Light:It is recommended to use green/blue light as read successfully Read 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-Databar (RSS) 2D: QRCode, DataMatrix, PDF417 Withstand 1.2 m drop on concrete floor (50 times 1.2 m drop on concrete floor repeatedly) Provide User Manual You can download the GM803 Serial user manual from this website link: https://.dropbox.com//buysgr2aeutuub3/AADsvupiGseFm-6IowMBWGCOa?dl=0 Operation video on : https://.be/dsYZHYoca00 Material:pcb colour:Black Package Contents: 1 x GM803-S 5-30cm lens Only the above package content, other products are not included. Note: Light 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 +/- 1-3cm.