If you have any question about our product, free contact with us in the first time and we will be glad to help you solve all the problem. 42 invisible led ceiling fan light remote control chandelier +bluetooth speaker feature product invisible ceiling fan with light functionwith bluetooth speaker/without bluetooth speaker(for your choice) control methods remote control / bluetooth light sourceled chip (included) number of blades4 electronic materialssteel, copper wire voltage110v-120v room application8-25 square meters, suitable for assembling at your living room, bedroom, villa, lobby, restaurants, bars, shops, etc.