Cheapest price I've seen it.
$17.99 - 20% coupon = $14.39
Click 20% coupon before adding to cart.
Single pole only.
No hub required. Uses the TP Link Kasa app on your smartphone. Also works with Alexa and Google Assistant.
Operates on 2.4 GHz WiFi.
Neutral wire required.
I have two of these and four of their smart outlets, and they've been rock solid for me. YMMV on that, but I have strong WiFi throughout my house with multiple access points, so my 2.4 GHz isn't on a single, saturated channel.
*Edit* Screenshot added.