Metal whistle referee signal whistle
▸ Product Type: Metal Referee Signal Whistle
▸ Material Construction: High-density Metal Shell
▸ Acoustic Structure: Dual-cavity Resonance Design
▸ Operation Mode: Push-Pull Mouthpiece Adjustment
▸ Component Configuration: Single Complete Package
▸ Material Construction: High-density Metal Shell
▸ Acoustic Structure: Dual-cavity Resonance Design
▸ Operation Mode: Push-Pull Mouthpiece Adjustment
▸ Component Configuration: Single Complete Package
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