+1 on what Fenderman said; this is how AliExpress has setup their database. It would have been better if the developers had allowed four (3) different columns (data input fields) but also allowed their vendors to specify four (4) different labels (a different text label for each field). As it is the developer "per-labeled" each of these fields (380TVL, 540TVL=4mm lens, 600TVL & 700TVL), therefore all AliExpress camera vendors are stuck with these TVL labels.