The USB cable continuity tester (type A to type micro-B cable) functioned as advertised. It arrived in a bubble pack that showed damage, but the product was unharmed. I can now determine if the cable has a shield, data, power, and continuity. By wiggling the wire near the connectors, I can also find intermittent problems. I sorted my cables into four categories. 1: continuity, power, data, shield; 2: continuity, power, data; 3: continuity, power; 4: intermittent or no continuity. I noticed that all my power-only cables lit up the power-B light when the USB micro-B end of the cable was plugged in, even before the USB A end was plugged in. Shipping was acceptable as the product was not damaged, although the packaging suffered a couple of punctures. Whatever cause the damage to the package missed the product as it arrived with no visible damage. The product did not arrive with any documentation. None was actually needed as the function of the device is very simple, Plug both ends of a cable into the device and note the configuration of the illuminated lights. The rest is common sense, such as completely disconnect the cable before using the device. Communication was by email. As for the star ratings: Product five stars (OK) because the product lived up to its advertising; Shipping four stars (NEEDS IMPROVEMENT) because the package was damaged during shipping; Documentation four stars (NEEDS IMPROVEMENT) because it came with no documentation (an insert with relevant product information would have been better, even if redundant); Communication five stars (OK) as the email was sufficient. If there were only a single rating, it would have been five stars (meets expectation).