Features 1.WIDE USES JACK: 3.5mm earphone jack can be connected to display spectrum, recording pen, transmitter, wireless equipment, etc. (not included), but also can be inserted into the dual channel for direct recording. 2.SUPERIOR SOUND: High sensitivity sensor head with new components and advanced technology, so that penetration increased several times, sound quality greatly improved, carefully and slowly adjust the sound, so as not to cause discomfort in the earplugs, with decibel pressure meter, the sound size can be seen at a glance. 3.HIGH SENSITIVITY: Alignment with the high sensitivity metal of the headset improves sensitivity and sound quality. More convenient use experience. Highly sensitive detection of sounds coming from wall, windows, doors or armor plates, with headphones to provide clear sound quality. 4.LONG BATTERY LIFE: With charging port, the built in battery can be recharged repeatedly and can be used for 5?7 hours at a full charge. Machine jack and upward switch knob. Humanized design, easy to use and adjust. 5.EASY TO OPERATE: Simple to operate, close to the door, window, wall, use the knob to adjust the sound until you hear a clear sound, able to make sound from wooden wall, brick wall, window, door, effectively filter noise and detect sound faster. 6.MULTIPURPOSE: It can detect abnormal noises from heating pipes, fire pipes, water pipes, floor heating pipes, automobile, home pipes and so on. specificationItem Type: Sound Amplifier Material: ABS Amplifier Battery: Polymer Lithium Ion Battery (Built In) Capacity: 100mAh Sound Input: 32 Ohm Headphones Probe Sensitivity: -60db Maximum Sound Amplification: 13000x Working Time: 5-7 Hours Probe Power Consumption Current: 12mA Use: Can Detect Heating Pipes, Fire Pipes, Water Pipes, Floor Heating Pipes, Automobile Abnormal Noise, Household Pipes PackageList 1 x Amplifier 1 x Pressure Gauge 1x 3.5mm Earphone 1 x USB Cable 1 x Instruction Manual