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UPDATE: After TP-Link saw my review, I received an email saying they wanted to help and asking me to click a link to customer support. Despite not wanting to waste more time, I fell for it, thinking I would get a live chat or a callback. Nope. I clicked on the link, which required me to send yet another email. I did not get a response until two days later asking me to call the main tech support number (which ihad already spent an hour with before, as described below). I called twice today after getting yet another email telling me they were going to close my support ticket unless I called. Got the usual VM system. After being told each time that I was customer 1 on the wait list, within two minutes, the support service switched to another line or area, and kept asking me in Chinese and English to "please dial the extension directly." What extension? It gave no options. It repeated this message continuously. After a few minutes of hearing this repeated and no one picking up, I hung up. If I could reduce this rating to zero stars, I would. ORIGINAL REVIEW: Worked fine for a few weeks, then stopped allowing consistent local (via phone or tablet on same wifi network) control. Worked fine if I turned wifi off on my phone and connected to devices via Kasa app remotely. On wifi, sometimes the devices could connect, sometimes no, telling me to "try again later". Spent over an hour with various tech support people. Upgraded firmware on each plug. When they told me to then reset and reconfigure one device to test, the Kasa app (on phone or tablet) will see and connect to the new device, but will not let me add any new devices anymore because it will no go past the device naming screen (even if I attempt to leave the default name). So the update and reset made the reconfigure plug device unusable. The other devices I updated (but did not reset) and they work fine for remote control. But i still cannot control them via my devices if they are on the same wifi network. Another tech product that is supposed to make life easier, but makes it more difficult by requiring and wasting our time, by not reliably doing the very job they are sold. These "Smart Home" devices are dumb, and not ready for actual consumer use