Abstract: An electronic level indicator for facilitating the leveling of RV's including battery-powered base and handheld mobile units with an RF link between them. A sensor in the base generates a coded signal transmitted to the mobile unit which activates LED's in a pattern showing low corners of the RV.

Abstract: A whistle attachment is shown for a multi-implement tool which may be of the folding knife type. The whistle is attached and located in a manner to provide quick and easy access to the whistle in an emergency situation such as an attack or potential attack by a miscreant. The whistle is made for attachment to the existing structure of the tool to provide economy and ease of manufacture. In a preferred embodiment the whistle is made for use by blowing by mouth into an opening in the whistle. This avoids the potential for failure of a power source if battery or other power means were used to sound the whistle. The whistle also serves as a decorative cover for a multi-implement tool and does not depend on any structure of the tool to complete the whistle.