That battery one is nice. I like that. Though batteries (or a wired-power wireless-signal) are less environmentally appealing, imo. (Unless the wireless switch only uses power at the switching moment..?)They also have wireless switches that run on a battery. They are paired with the powered switch. So you could have a switch downstairs without snaking another wire.
Thinkbee Wireless Lights Switch Kit, No Wiring Mini Remote Switch, No WiFi Needed, Outdoor 1969ft Indoor 328ft Remote Control Lighting Fixture for Led Light, Ceiling Lights and Lamps, Waterproof Amazon product ASIN B0814R5PSX
I'll check into that. I like the solution preventing a wire.