Intallation Note 1.Please don't install 2 software versions in the same computer. Files with each other. One computer can only install one software. If you want to reinstall another version in the same computer, you need to reset system or format C disc. 2. software needs to be closed when installing driver otherwise some files might be deleted. 3.Please make sure the Voltage is up to 12V 4.Please put [all parts] all together to the present folder Note: Both of them can NOT update Firmware/ Driver. Don't Update!!! Otherwise it be locked and need to repair What's the different between 1.6.6 version and 1.8.4 version? 1.6154 v1.6.6 Firmware Version is 1.6.6.0; License to 2030-12-31(can only install CD v1.6.6 driver, CANNOT UPDATE the Firmware and License to 1.8.4.0 or newer) 2. 6154 v1.8.4 only works for V series 6154 v1.6.6 only works for /V series 3. 6154 v1.8.4 can work with V5.1.6/V6.2.0/V7.1.1/V7.2.1..... 6154 v1.6.6 only works CD software, 1.6.6 only support the software version under 6.2.0 ( never try to install higher version!!! ) 6154 Computer System Requirements: Win 7 Professional version/WIN 10 System C:// have to be NTFS format C:// need to have at least 40GB avaliable space for installing 6154 Color: As Shown Material: plastic Package Contents: 1 x 6154 Interface 1 x USB cable 4 x CD 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 +/- 1-3cm.