| 型号 | 制造商 | 描述 | 操作 |
| SMA-21-L-P17,5 [更多] | Sonitron nv | Piezo Sound Generator Dimensions W x H x D: 21 x 21 x 9.5 mm Frequency: 3300 Hz Operating temperature: -20...+70 °C Volume: 88 dB @ 30 cm Current consumption: max. 9.5 mA Tone type: Continuous Tone Loud Contact spacing: 17.5 mm Operating voltage: 1.5...24 VDC
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