| 摘要 |
<p>A mains powered battery charger suitable for charging a rechargeable electrical device, comprising an audio alarm which sounds when the charging device is connected to a mains electricity supply and is not charging. The audio alarm may sound for the entire time the charger is not charging and yet is still connected to the mains electricity supply. Thus, when the charger is not charging, the audio alarm alerts a user to switch off the mains electricity supply to the charger.</p> |
