| 摘要 |
A warning unit (10) comprises an upright housing in which a sound emitter is disposed, and a sensor (18) for responding to the approach of a pedestrian to energise the sound emitter: a suction device is provided in the bottom of the unit for engaging the floor to retain the unit in position, the suction device having an actuating lever disposed within the housing and accessible through a normally-locked door (16) of the housing.
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