Product Name:  3S POWER SUPPLY 
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THIS POWER SUPPLY IS SPECIALLY FOR BMW OPS PROGRAMMING.
USUALLY FOR PROFESSIONAL PROGRAMMING FOR NEW BMW AND MAINTAINING COSTANT VOLTAGE AND CURRENT DURING VEHICLE ASSEMBLEY TO PROGRAMMING
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During programming power levels must be maintained in a narrow range to minimize the chance of damaging controllers. It must be adjusted voltage between 12.8 till 13.5 Volt before connect power cable to car battery. There is a LCD Monitor to show the statistics .
It is no need to run a car to supply for permanent and stable voltage.
It can adjust the AC and DC .It is very strong and stablization.
Recommended by almost all manufacturers from BMW and Mercedes Benz to Volvo, Porsche, Volkswagen, Audi, Mann and many others.
Not a Battery Chargers .