3 In 1 Decibel Meter: The large-screen decibel meter uses a high-precision decibel detection chip to continuously monitor noise levels, temperature, and humidity. Compared with traditional handheld decibel detectors, it is more suitable for home use. Simply turn on the power to continuously monitor and clearly display multiple air quality readings on the large screen. Portable Decibel Meter: The device is powered by a built-in 2700mAh lithium-ion battery and comes with a USB charging cable. The charging port is included in the package, allowing convenient operation anytime and anywhere. For long-term use, it is recommended to keep the device plugged in. High-Precision Decibel Detector: This sound level meter features an intelligent air semiconductor sensor that delivers more sensitive, accurate, and stable measurements of decibel levels, temperature, and humidity compared to standard sensors. Measurement range: 30–110 dB, accuracy: ±3 dB; humidity range: 0–95%, accuracy: ±5%; temperature range: 14–122 °F, accuracy: ±2.7 °F. Easy to Use Decibel Meter: This portable device is simple to operate. Press and hold "O" to power on/off; press "-" briefly to switch temperature units; press and hold "+" to enter or exit the timer function. Color: As shown in photo Material: ABS Package Contents: 1 x Noise Meter 1 x USB Charging Cable 1 x English Instruction Manual Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement tolerances may vary by +/- 1–3 cm.