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130cm cable,this cable can replace 9V AA+AAA Battery,cut the 5.5x2.1mm, and connectings to your devices Wide Application: Mainly Used To Adjust The Brightness Of Single Color LED Lights, Such as 3528, 5050, 5630 LED lights for lighting, holiday, fan, car lights,car fan and so on The module cable is DCDC adjustable step up/down power supply module with 2Bit LED digital tube display. Display output voltages in real-time. Rotate potentiometer to adjust output voltages With 3 adapters 2.5x0.7mm,3.5x1.35mm,4.0x1.7mm 1.3V-12V Wide voltages output boostings and ,with on off switches,1.3V-5V output 3W,6V-12V output 6W