The rated voltage: DC 12V Voltage range: DC 7V-13.6 V The input power: 0.24 A The rated speed: 9500 R.P.M Temperature range:-10C-70 C Txpect life: 25 C L10 when expected life 50000 hours Bearing structure: free maintenance dual ball bearings Rotation direction: the wind from stents place eduction, facing the rotor counter-clockwise The wiring way: + red-black signal: blue (blue line, the alarm line speed, it is necessary to pay attention to). Line about long The biggest air volume: 26.8 m? / h The electric motor protection : overload protection, wrong level protection and stall lock current protection Minimum wind pressure: 0.. 120 Pa Noise index: 41.9 dB (A) Material qualitative material: glass fiber reinforced plastic, PBT shell, PA blades Function explain: electronic reversing the rotor dc fans, complete electronic directional control components Specification: 1. 8 key 2. 8 LED common cathode 3. 8 a digital tube common cathode 4. It can directly connect to microcontroller such as STC. Use TM1638 digital tube drive chip to drive common cathode LED digital tube Material: electronic components Wiring method: VCC GND 5V power supply, STB CLK DIO MCU I/O port. Size: approx. 7.5 x 5cm/2.9 x 1.9inch Package Includes: 1 Piece TM1638 Digital Led Display Module Note: Due to the quality differentiation of monitors and lighting effect, the picture may not reflect 100% the actual color of the item Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.