This "turtle" accepts 2 bulbs (E27), so it includes 2 sockets. The issue is that there is no connection between the two sockets, which means that it gives you the ability to connect it in multiple ways. Either with a double switch to turn on either one lamp or the other, or both at the same time. In the case of simultaneous connection, you should be careful not to connect them in parallel, so in case one burns out, the other will not turn on either. For amateurs who want to install it themselves, they should pay attention to how they connect the "turtle" to the power supply depending on the situation. The sealing it provides is with a PVC gasket between the glass and the metal base, so as long as the PVC "lives" and the sun does not burn it, it seals just fine. The glass is thick enough to not be afraid of it and not excessively heavy. It is supported well with 2 6-inch screws. It does not have a cable clamp in the hole for the power supply cable, nor any gap from the wall, so it is assumed that it will be placed in the position of the outlet and you cannot "run" the cable behind it.