Features 1、Data storage function allows to store up to 15,000 groups of data.Connect with the computer through USB cable, which supports data record download, real-time sampling analysis, and graph & data printing. 2、Real time display the current temperature(℃/℉ switchable) and humidity. 3、2.7in large LCD display screen, easy to read and use. 4、Wide measurement range from 30dB to 130dB, Frequency is 31.5Hz - 8KHz, Resolution is 0.1dB, Accuracy is ±1.5dB. 5、With A and C equivalent weighted sound pressure levels and fast and slow dynamic characteristic mode. 6、Both AC and PWM signal output are available. 7、It has low power indication, automatic and manual power off function. 8、It comes with sponge balls and a sturdy storage box. Small and light, easy to carry. 9、Suitable for checking, monitoring or controlling the sound level of individuals, families, businesses, learning, industries, etc. Specification Condition: 100% Brand New Item Type: Sound Level Meter Material: Plastic Color: As shown in the picture Weight: Approx.745g/26.3oz Model: AS844 + Calibrated Sound Source: 94dB @ 1KHz MeasuringRange: 30-130dBA / 35-130dBC Accuracy: ±1.5dB Resolution: 0.1dB Dynamic Range: 50dB / 100dB Overload Indication: OVER / UNDER Frequency Weighting: Characteristics A and C. Digital Display: 31/2 digits Analog Bar Chart: 1dB / 1 bar chart SamplingRate: 20 times / sec AC Signal Output: 1 Vrms / full strip grph Dynamic Characteristics: FAST / SLOW Data Storage Capacity: 15000 Maximum Hold: Support Automatic Power Off: No operation after 10 minutes Microphone: 1/2 inch polarized capacitor Power: 3.7V lithium battery 1000mAh / USB 5V Battery Life: 12 hours (continue use) Temperature Measurement Range: 0-45 ° C Temperature Accuracy: ± 2 ° C Humidity Measurement Range: 10-99% RH Humidity Accuracy: ±5% RH Package List 1 x Sound Level Meter 1 x Instruction Manual 1 x USB Data Cable