30pcs 27mm Copper Disc with Aluminum Casing Wired Piezo Buzzer Sound Cavity for Drum Trigger Guitar Pickup

High Sensitivity & Low Power Consumption 4.1 ± 0.6 kHz resonant frequency; 1.530V operating voltage; 28000±30pF capacitance; 1.8 µA sleep mode current; ideal for acoustic instrument pickups and drum triggers; Durable Copper-Plated Aluminum Design Copper-plated disc with aluminum shell; -30°C to 70°C operating range; corrosion-resistant construction; suitable for DIY electronics and homemade instruments; Easy Installation & Universal Compatibility Pre-wired for quick setup; compatible with Arduino and Raspberry Pi; works with contact microphones and foot stompers; no calibration required; Versatile Sound Detection Solution Perfect for guitar pickups, drum triggers, and vibration sensors; low power consumption; reliable performance in various environments; Robust Build for Long-Term Use High-quality copper and ceramic materials; resistant to mechanical stress; designed for hobbyists and makers; not for high-voltage systems