| 摘要 |
In one preferred embodiment, a laser pointer includes a connector for connecting the laser pointer to a computer, a regulator connected to the connector for regulating a voltage from the computer, a voltage converting circuit connected to the regulator for converting the voltage from the computer to a needed voltage, a charging circuit receiving the needed voltage, a rechargeable cell charged by the charging circuit, a switch, and an output circuit connected to the rechargeable cell via the switch for outputting laser light. When the laser pointer runs out of power, the notebook computer may charge the laser pointer. It is convenient and economical.
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