FOR SALE IS ONE (1) NEW VOLTAGE DOCTOR USB TESTER FOR USB INPUT TESTING OF VOLTS AND AMPS BY VOLTAGE DOCTOR BRAND MPN TC35002. TEST YOUR USB INPUTS, MEASURE VOLTAGE AND AMPERAGE OF YOUR USB PORT, OR USE OF CURRENT ON ANY COMPUTER OR EXTERNAL USB DEVICE WITH THIS HANDY TOOL. NO BATTERIES REQUIRED, JUST PLUG INTO A USB PORT AND RECEIVE ACCURATE VOLTAGE AND AMPERAGE READINGS (3.5v-7.0v and 0a-3a range). CONNECT A PERIPHERAL DEVICE TO THE TESTER OUTPUT TO DETERMINE POWER CONSUMPTION OF THE EXTERNAL ATTACHED DEVICE. THE CHARGER DOCTOR DEVICE DELIVERS VOLTAGE AND AMPERAGE ACCURATE LED READINGS, ALLOWS FOR QUICK AND EASY IDENTIFICATION OF A NON WORKING OR MALFUNCTIONING USB PORT(s). DUE TO ABUSE OR CONSTANT USE, MANY USB PORTS, USB CABLES OR USB DEVICES WILL SOMETIMES FAIL, OR WORK INTERMITTENTLY. TEST USB PORTS, CABLES AND DEVICES FAST AND EASY. TEST FOR FLUCTUATING POWER THROUGHPUT TO EXTERNAL DEVICE AND MEASURE EXTERNAL DEVICE POWER CONSUMPTION. BRIGHT LED DIGITAL READOUT IS ACCURATE AND EASY TO READ. YOU WILL RECEIVE ONE (1) VOLTAGE DOCTOR USB TESTER SHIPPED USPS FIRST CLASS MAIL..... note..... many usb ports have been used too long and so many times, they provide undependable service, sometimes working intermittently. this voltage doctor usb tester allows for a quick test by simply plugging it into any usb port. if you receive a reading, the port is functioning. if desired, you may further analyze voltage and amperage readings further, for more detailed and extensive testing. BID AND BUY HERE IN IN ABSOLUTE CONFIDENCE SINCE I HAVE THOUSANDS OF POSITIVE FEEDBACK AND TEN+ YEARS EXPERIENCE. I SHIP WITHIN TWO DAYS OF RECEIPT OF PAYMENT, OFTEN THE NEXT DAY. FREE USPS FIRST CLASS GREEN SHIPPING USING RECYCLED PACKAGING MATERIALS AND ENVIRONMENTALLY FRIENDLY MATERIALS TO ANYWHERE USA. I DO NOT SHIP ANYWHERE ELSE. HAVE A GREAT DAY AND THANK YOU FOR STOPPING BY.......