A lift lock for blind is disclosed to include a shaft pivoted to a headrail of a blind for synchronous rotation with a lift rod of the blind. The robot cleaner system includes an external recharging apparatus with a power terminal connected to a utility power supply, a recharging apparatus recognition mark formed on the external recharging apparatus, and a robot cleaner, having a recognition mark sensor that detects the recharging apparatus recognition mark, and a rechargeable battery. In another embodiment, a single long tethering cord extends around the back of the user, with both ends being connected to the electronic device. The inner surface of said plate is proximate to said planar object’s side edge, defining an angular relationship therewith. In combination these traits set \u2018CHOCOLATE SUNRISE\u2019 apart from all other varieties of Canna known to the inventor. A wave front compensation device is designed for this invention.