Feature 1 High Accuracy: Digital decibel meter, noise measurement range 30 130dBA, accuracy: 1.5dB, resolution: 0.1dB. automatic switch off function is switched off, noise values can be measured continuously. 2 Convenient to Use: The noise level meter is made of high quality soft rubber button material with a comfortable feel and non slip design on the side; HD LCD backlit display with clear numbers for easy use at night. 3 Multifunction: Sound monitorr with backlit alarm, large LCD display, maximum or minimum noise monitoring, data hold function, automatic or manual switch off, sound level meter for continuous measurement of noise values, battery indication, etc. 4 Practical Tool: This decibel meter is a great tool for checking, monitoring or controlling and test the sound level of any environments. It is widely applicable for families, business, studies, industrial and etc. 5 Wide Application, Portable Design: Digital sound level meters are ideal for music recording, home theatre setups, neighbour noise complaints, work sites and noise pollution monitoring. Small and portable, easy for carrying.Item Type: Digital Decibel MeterMaterial: ABSModel: RZ1359Colour: Black and YellowBattery Type: 3 x AAA Batteries Required (Not Included)Measuring Range: 30~130dBAAccuracy: 1.5dBResolution: 0.1dBFrequency Range: 31.5Hz - 8KHzFrequency Weighting: AMicrophone: 1/2 inch Electret MicrophoneRange of Application: Ideal for Music Recording, Home Theatre Setups, Neighbour Noise Complaints, Work Site and Noise Pollution Monitoring Package List1 x Digital Decibel Meter (Battery Not Included)1 x Windproof Ball 1 x Operation Manual 1 x ManualNoteHow do I set the alarm value?1. Short press the "Hold" key in the poweron state2. Press and hold the "LED" key for about 2s to enter the setting interface (default 100dBA prompt)3. Press the "Maximum/Min" and "Hold" keys to reduce or increase the alarm value4. Press "LED/Power" to save the setting.When the current sound value is less than the set value, the backlight flashes(whether you turn on the backlight or not)