Abstract: The present disclosure describes a security ring mated to a cup lid of a disposable cup for a spill-proof purpose. The security ring, when engaged with the paired cup lid, provides a seal for the disposable cup as well as inseparableness from each other in the event the disposable cup is toppled or falls from a high ground. The engagement in the first embodiment of the present disclosure between the security ring and the cup lid arises from a secure reception of one or more interlocking members on the cup lid by one or more corresponding retaining members on the security ring. The engagement in the second embodiment involves a hitching member and a receiving member on the security ring capable of latching up therein at a plurality of locations so as to accommodate the cup lid having a plurality of heights and shapes.

Abstract: To detect parked vehicles at night, the present invention discloses night-detection device and method. The night-detection device comprises a moving-vehicle sensor and a parked-vehicle sensor. It uses the light beam from a passing-by vehicle to detect parked vehicles.