| 摘要 |
A combination compass is constructed to include a housing, a compass device mounted inside the housing, a top cover pivoted to one end of the housing and being capable of covering over the compass device. The top cover has a mouthpiece, a resonance chamber, an air passage connected between the mouthpiece and the resonance chamber, and a sound producing device disposed in the air passage and adapted to produce sound when the user blowing air into the mouthpiece with the mouth.
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