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1, Only supports 2.4Ghz WiFi, 5Ghz WiFi does not support, So when using it, you need to make sure that you are connected to 2.4Ghz WiFi. 2, The light bulb and mobile phone need to be as close as possible to the router when connected, it will not connect when the WiFi signal is not good. Watch the instructions on your phone. 3, You can connect the lamp when placed in a good signal, after connecting, you can move to another place. Be sure there is a WiFi signal. 4, The manual has video teaching and electronic version of the manual in the end. 5. If you still have a connection failure, please contact the seller. We will give you a 100% satisfactory result. 6,When you give a negative comment, we don't know who gave it, and our service team can't do anything for you. When you contact us, we can send you a new one or refund or something. Specification: Rated Voltage:AC100-250V Rated Power: 7W Means it won't be very bright in a big room Color Temperature: 6000K+RGB Lamp Interface: E27 WIFI Standard: 802.11b/g/n System Supported: IOS/Android Material: PC,Aluminium Alloy