Usage Tips: 3 In 1 Decibel Meter: The large-screen decibel meter uses a high-precision decibel detection chip to continuously detect noise status, temperature and humidity. Compared with traditional handheld decibel detectors, it is more suitable for home use. Just turn on the power, continuously detect and clearly display multiple air indexes on the large screen Portable Decibel Meter: The decibel meter is powered by a built-in 2700mAh lithium-ion battery, equipped with a USB charging cable, and the charging port is also included in the package. You can operate it anytime, anywhere. We recommend that you plug in the product for long-term use High-precision Decibel Detector: This sound level meter uses an intelligent air semiconductor sensor to test decibel temperature and humidity values, which is more sensitive, accurate and stable than ordinary sensors. Measuring range 30-110dB, accuracy: 3dB; humidity range: 0-95%, accuracy: 5%; temperature range: 14-122, accuracy: 2.7 Easy to Use Decibel Meter: This portable decibel meter is simple to use, long press "O" to turn on/off the product; short press "-" to switch the temperature unit /; long press "+" to enter/exit the product timing function Colour:Photo Color Material:ABS Package Contents: 1 x Noise Meter 1 x USB Charging Cable 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.