Purchase instructions:
1.The product is powered by USB cable, please confirm before purchase, you have USB socket applicable
Product has no battery, it uses AC power supply
2.Usually in a very quiet room, the value will not be lower than 40dB, which is normal.

Description:
Large digital LCD display
Measurement range is 30 ~ 130dB
The indicator light blinks and buzzer Alarm
Use the device to measure noises inside or outside.
With hanging holes, can be hangged on the wall
DC 5V 1A micro USB power supply

Specifications:
Model: SW-525A
Measurement range : 30 ~ 130dB (dB)
Accuracy: +1.5 dB (reference sound pressure level, 94dB @ 1kHz)
Frequency response: 31.5Hz ~ 8.5kHz
frequency weighting: A
Response time: Fast
Microphone: 6mm condenser microphone
Power supply: DC 5V 1A micro USB
working environment: 0 - 40 degrees (32 degrees Fahrenheit to 104 degrees Fahrenheit), 10 - 80%RH
Storage of Temp. and humidity: -10~60C. 10~70%RH

Package Included:
1 x SW-525A sound level meter
1 x USB cable​
1 x Manual

Brand:
TestHelper