Power supply is a switch, switch the power supply once to change the working mode, there are three working modes: 1 light on, 2 fan work, 3 fan + light work together Built-in 3 fan is great for kids room and nursery, also can be used for living room,, bedroom, kitchen, study and more, brings you cool in hot Measures 10.2 inch in diameter and 4.7 " in height, built-in 30w cold white LED light, soft wind and low noise, adjustable in three gears Two-in-one design, it is not only a LED light with E27 lamp for head, but also the fan, along with a B22 to E27 adapter, allows you to extended connetcion with more devices, AC 86V-265V wide voltage Flush mount, simply screw into any e27 light socket, no wiring necessary, no professional electrician, quick efficient installation