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SUPERIOR 4-IN-1 DC LAB POWER SUPPLY: When you buy our RUZIZAO dual DC power supply, it's equal to having two 120V 3A DC power supplies and one 120V6A and one 240V3A DC power supply, which saves your budget and provides ease of use. Positive and Negative Voltage Output Simultaneously: The dual DC power supply uses wires to connect the positive pole of CH1 to the negative pole of CH2, which can achieve simultaneous output of positive and negative voltages. Negative voltage is output through CH1, and positive voltage is output through CH2. Please note: The positive and negative pole connection of CH1 should be reversed, with the positive pole connected to the negative pole output and the negative pole connected to the positive pole output. Serial and Parallel Function: RUZIZAO Bench power supply new model was add very convenient serial and parallel function, press ‘INDEP’ which is two 120V 3A lab power supply, press ‘SER’ button of dual DC power supply, you will have a 240V3A DC power supply, press ‘PAR’ button, it will be switched to 120V 6A DC power supply. This will satisfy your need for a higher voltage or higher current power supply. It is a good helper in your work, which saves your time to get a better DC power supply! Wide Range of Uses: DC power supply in today's life or work belongs to the immediate needs, including but not limited to laboratory experiments, electroplating, LED lamp inspection, or rechargeable battery charging, mobile phone repair, home appliance repair, DIY, and other occasions that require the use of DC power, you can use our DC power supply. 4-digit display and encoder exact adjustment: The DC power supply voltage and current value of our company is accurate to 0.01V and 0.01A, using encoder to more accurately regulate the desired current and voltage, and make the refinement to the extreme! Two sets of encoder knobs, when the power supply is in INDEP state, you can adjust the current and voltage values of both sides separately Two super temperature control fans and OCP protection function, CE/FCC multiple international certificates: The DC power supply has two super fans to cool down the temperature, and the OCP function to prevent the DC power supply from overloading, so that the DC power supply can be used safely for a longer period of time, and the power supply's life can be longer. We have CE/FCC and other certificates, with absolute quality assurance. High quality products and efficient after-sales service: When you purchase a DC power supply, you will receive 1*DC power supply, 1 * Output Power Cords , 2* Input Power Cord, and 1*user manual. If you find that the power supply does not work or the screen does not display after receiving the goods, please let us know. If you have anything you don't understand in the process of use, please let us know.