Single-link single-control switch---refers to a switch used to control a lamp or electrical appliance, and is generally a conventional variety that is equipped when handing over a house

Single-link dual-control switch---refers to a switch equipped with two switches to control a light or electrical appliance in different positions, usually when entering the light in the living room or hallway. The lamp in the hall can be turned on when entering the door, and the other one can be installed around the bedroom or sofa to control it off. Conversely, the light can be turned on when you leave the bedroom door or when needed, and turned off when you leave the unit. It is also better to install a pair of such lights at the bedroom entrance and bedside to control the main light source in the bedroom. Some people like to use the remote control, this is also possible, but the premise is that the quality of the remote control must pass. I heard that the life of the remote control receiver is not long, but it is estimated that the quality of the big brands may be guaranteed.