Abstract: Embodiments of the present disclosure disclose an abnormal area marking method and a related apparatus. The method includes: when a predicament is detected during an operation process, determining an area of a current position as an abnormal area; obtaining a sensing data set within a specified time period during the operation process, where the sensing data set is a set of data acquired by a sensor, and the specified time period represents a safe traveling time period before the robotic lawn mower gets into the predicament; determining abnormality description information of the abnormal area based on the sensing data set; and determining a target position corresponding to the abnormal area on an operation map, and establishing an association relationship between the target position and the abnormality description information.

Abstract: A power shaver having a hand-cranked dynamo is disclosed. The shaver includes a battery that can be charged by the hand-cranked dynamo, or from an alternating current adaptor that delivers charge from another battery, or from a charger that connects to a conventional source of alternating current. The shaver includes a foldable handle that allows a user to operate the dynamo, and folds against the body of the shaver when not in use. Indication lights located on the body of the shaver provide charging and status information to a user.