The price may be cheap, but it is inconvenient because there is no ON and OFF switch at hand. It is convenient to buy a switch with the same price range recently in energy saving, so you will not buy again.
I bought 4 bottles, and one bottle off. It did not light up. Since the illuminance is reasonable, I should purchase several pieces if the illuminance is necessary. By the way it was a rudimentary thing saying that solder was disconnected because it was not lit, so I repaired myself. Since there is no further switch, it is convenient to use an extension cord with an intermediate switch or a switch outlet.