This typically means you will need to open holes in your wall to pull the new wire. Wemo dimmer switch seamlessly replaces your existing dimmer switch and works with any one way connection light.

Belkin Official Support Wiring Diagrams Of Wemo Wifi Smart
Wemo dimmer no neutral. This smart dimmer connects to your existing home wifi network to provide wireless control of your lights with no subscription or hub required. You should be good to go with any smart switch. A switch box with no neutral loop will usually only have three wires see image below. You need neutral wires to install a wemo dimmer. Though as installing this dimmer to replace a switch or dimmer with no neutral line starts pushing this into a medium difficulty job rather than an easy one. If you open your switch box and you see two white wires joined with a wire nut not connected to the switch you can be fairly sure your switch has a neutral loop.
Easy install perfect for diyers. Use a different smart switch the lutron smart dimmer if you dont have the existing neutral in the switch box you will need to pull shielded romex wire to electrical box. Yellow ground wire black line wire. If you dont want to use in wall switches or dimmers recently launched are a handful of in wall micro controller devices that do not require a neutral wire and work with any switch you choose. Wemo light switch installation no neutral. Aeotec nano dimmer bypass.
From bedroom lights and dining room chandeliers to recessed lighting wemo dimmer can control nearly anything that a traditional dimmer switch can. Otherwise nothing will work. Do not try to do it without neutral wires and be careful not to reverse the line and load wires.