Water Leak Detector Superior Performance Clear Sound Quality High Sensitivity Underground Pipe Leakage Monitor EU Plug 110‑240V Item Type: Water Leak Detector Material: Plastic Size: Approx. 6.5 x 3.5 x 11cm / 2.6 x 1.4 x 4.3in Battery (Built In Battery): Lithium Battery, Model: 883759, Capacity: 1200mah Working Time: 10-23 Hours (according to the sound intensity) Functions: Soundfilter, sound peak limit, spectrum display, double sided probe, expansion hole function 1. Soundfilter: There are four gears: 0, 1, 2, and 3. Gear 0 is the gear in normal use: gear 1 emphasizes bass detection; gear 2 emphasizes treble detection; gear 3 forces detection. 2. Peak sound limit: When the (SOUND, LIMITERI) function is turned on, the huge peak volume is limited to protect the sensor head and maintenance instrument. It is usually placed in the open position. 3. There are nine display interfaces for spectrum display, which can be switched freely according to your convenience, and the display strength can also be adjusted. 4. Double sided sensing head: FL-550 adopts double sided sensing design, and the sound quality of both sides is different. It is determined which side is clear e according to the environment. The sensing sensitivity is stronger, the sound is clearer, and the sensitivity and service life are greatly provided. 5. Expansion hole function: (REC) 3.5 jack can be connected with external overlay function, wireless device upgrade of recorder transmitter, etc., and can also be inserted with dual channel lead for direct recording. Pickup parameters Charging Duration: 3-5 hours Battery: Lithium battery, 220mAh (built in battery) Sound Acquisition Time: About 5-6 hours, current about 40 mA Continuous Playback Duration: About 6-7 hours, current about 35 mA Support 32g memory card (not included memory card)Weight: Approx. 1434g / 50.6oz