Sensitive Solid-Surface Sound Detector

Lightweight plastic device in black finish; exact dimensions and weight unspecified (allowing ±1–3 cm tolerance). Contains a built-in 180mAh lithium battery, recharged using the supplied USB cable. Contents: 1 x listening device, 1 x USB cable — no extra parts or accessories included. Delivers superior sound pickup from physical contact with solid objects — particularly effective on wood, metal, masonry, and piping. Audio is delivered privately through built-in headphones, minimising external sound bleed and maximising clarity. Volume is adjusted manually and incrementally to suit individual hearing thresholds and ambient conditions. Designed for practical applications such as identifying concealed plumbing leaks, checking room occupancy through doors, verifying structural integrity, or demonstrating wave propagation in physics education — all without drilling, dismantling, or invasive tools.