While the SwitchBot device itself certainly performs as advertised, the Grommet kit, not so much. The device has trouble negotiating up and over the junction where the slightly larger outer curtain rod and the smaller inner curtain rod meet. If the curtain rod was just one long rod, rather than an extendable assembly, the Grommet kit would operate flawlessly. I may try to adapt increasing longer split plastic tubes, with the shortest going on the inner rod first to the longest going on last, in perhaps four layers of 3"/6"/9"/12", with all four tubes butted up against the larger outer rod. This will form a gentler slope that should help avoid the device from getting hung up trying to climb over the larger outer rod.