1. Wide Uses Jack: 3.5mm earphone jack can be connected to display spectrum, recording pen, transmitter, or wireless equipment (not included), and can also be inserted into the dual channel for direct recording. 2. Superior Sound: Sensitivity sensor head with new components and advanced technology improves penetration and sound quality. Adjust the sound carefully to avoid discomfort in earplugs. Includes a decibel pressure meter for clear sound monitoring. 3. High Sensitivity: Alignment with high sensitivity metal of the headset enhances sensitivity and sound quality. Detects sounds from walls, windows, doors, or armor plates with clear audio through headphones. 4. Long Battery Life: Built-in rechargeable battery provides 5-7 hours of use on a full charge. Features a charging port and user-friendly design for easy operation. 5. Easy to Operate: Simple to use; place near doors, windows, or walls and adjust the knob for clear sound detection. Effective for wooden walls, brick walls, and noise filtering. 6. Multipurpose: Detects abnormal noises from heating pipes, fire pipes, water pipes, floor heating pipes, automobiles, and home pipes.