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Overview and Specifications:

Product Attribute
Accessory Type : Extension Board
Compatible With : Arduino.ARM

Material: metal
Weight: 28g
Color: blue 
Size(approx.): 75 x 48 mm/ 2.95 x 1.89 inch  
Rated Voltage: DC 12V
Voltage Range: DC 7.0V – 13.6V
Input Power: 0.24A
Rated Speed: 9500 R.P.M
Temperature Range: -10 ~ 70 Celsius
Wiring Way: + red, -black 
Signal: blue (blue line, the alarm line speed, it is necessary to pay attention to) 
Line Length: about 20cm  
Biggest Air Volume: 26.8m/h
Electric Motor Protection: overload protection, wrong level protection and stall lock current protection 
Minimum Wind Pressure: 0.120Pa
Noise Index: 41.9dB (A)
The Row needle is randomly sent in color.
Package List:
1 X 8-Bit Digital LED Tube TM1638 Key Display Module

Warm Tips:
The product is randomly sent in color.

Light shooting 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.