High-Precision Piezoelectric Sensor 15mm diameter; 8.5 ± 0.6 kHz resonant frequency; 8000 ± 30% pF capacitance; 1.5 to 30V operating voltage; no calibration required for consistent performance; Durable Copper-Plated Aluminum Housing Copper-plated aluminum casing; -20°C to 70°C operating range; resistant to environmental stress; ideal for long-term use in various DIY projects; Low-Power and High-Sensitivity Design 1.8 µA sleep mode current; 2000mAh battery life; high sensitivity for detecting subtle vibrations and sounds; suitable for portable audio applications; Easy Integration with Popular Platforms Compatible for Arduino; Raspberry Pi; STM32; pre-wired for quick installation; supports multiple development environments for flexible use; Versatile Sound and Vibration Detection Ideal for acoustic instrument pickups; contact microphones; touch sensors; foot stompers; works well with homemade speakers and electronic musical devices