The product is unused, but the packaging was damaged during transportation. Unopened product, repackaged in our warehouse, in perfect working condition, warranty is available. 【4 in 1 Multimeter】 This digital DC voltmeter ammeter is used to measure voltage, current, energy and active power of electrical appliances. It has been approved by CCC, FCC, CE certification. 【Measurement range】 Voltage test range: DC 6.5~100V, current test range: 0~100A, active power test range: 0~10kW, energy tester range: 0~9999kWh. DO NOT exceed the rated parameters. 【More functions】 Large LCD screen with backlight; voltage alarm function; energy reset function; data storage in case of power failure. 【Wide application】 This DC voltmeter is suitable for indoor use and cannot be used outdoors. It can be used to monitor volts, amps, power and energy consumption of battery, solar system, electric bicycle generator and other areas. The load must not exceed the rated voltage and current. 【Package】 Package: 1*DC multimeter (without shunt), 1*user manual. Note: Please connect according to the wiring diagram we provide. If you want to try another connection, please contact us first, poor connection may cause the product to burn out or not work. Product Description Voltmeter Ammeter Tester Indicator Voltage Current Power Energy Digital DC 6.5-100V 100A Volt Ampere Watt Multimeter LCD Display Panel Function to measure electrical parameters (voltage, current, active power, energy). Voltage test range: DC 6.5-100V, Current test range: 0-100A, Power test range: 0-10kW, Energy test range: 0-9999kWh. Voltage alarm function (overvoltage alarm limit, backlight and voltage flashing when alarm). The key restores the energy. Stores data in the event of power failure. Large LCD screen (displays voltage, current, active power and energy at the same time) Backlight function. Package: 1* DC meter, 1* manual. Please note that the package does not have an external shunt, if you want it with shunt, please see our other models: 100A+ 50A/75mV shunt and 100A+ 100A/75mV shunt. Function Backlight control Press the button to turn on or off the backlight. The backlight status is saved in the event of a power failure. Reset energy Press and hold the button for 5 seconds until the number flashes, then release the button. Press the button again, then the value of the energy will be cleared and you will exit the reset flashing mode. If you do not want to clear, press and hold the button again for 5 seconds until the number does not flash, it means the energy value is not cleared and you will exit the reset mode. Voltage Press and hold the button until the current display area shows "SET", release the button. The voltage range displays the current high voltage alarm value, the current range displays the low voltage alarm value, and the last digit starts flashing. Press the button to adjust the value. It will automatically change the digit without operation for 3 seconds, then press the button to adjust the value as well. Voltage alarm limit setting range: 6.5V to 99.9V. After completing the settings, press and hold until the display shows "PASS".