Wireless light switch and dimmer are anotehr useful smart home feature. Using smart lighting you can turn your house / room lights on and off from almost anywhere using a smartphone. You can also use an app to set schedule for lights to go on, dim or switch off.

Good in-wall wireless light switch and dimmers are phase-adaptive, and thus they can work with any lighting load. They are easy to install, come with a remote control, and are easy to schedule.

They are also compatible with all the big name smart home kits including Apple HomeKit, Amazon Alexa, Google Assistant, Wink, Nest, and IFTTT.

Barring a few select models, most smart light switches need a neutral wire in the switch box. 

The best wireless in-wall dimmer: Lutron Caséta Wireless In-Wall Dimmer (no need of a neutral wire, eays to use, multi-button keypad)

The best wireless in-wall dimmer bridge: Lutron Caseta Smart  (one bridge supports up to 50 devices)

The second best wireless in-wall dimmer: Belkin Wemo Light Switch (needs no hub, long Press feature to trigger other devices in the home)

The best affordable wireless in-wall dimmer: TP-Link Smart Wi-Fi Light Switch (app for Android and iOS devices)