1SMART MODE: Smart digital multimeters can automatically measure voltage, resistance, conductivity, and frequency at optimal resolution, very versatile 2AMP TEST AUTOMATICALLY ACTIVATION: The electrical amp tester can automatically activate current test function with red backlight. No need to switch, just plug the test probe into the amp port 3RECHARGEABLE AND REUSABLE: The smart pocket voltmeter come with a rechargeable lithium ion battery and charging cable, so you'll never have to worry about power 4VFD FUNCTION: The digital voltmeter with VFD function, which is suitable for high accuracy of variable control drive equipment. Also can be used to test capacitance, temperature, amp, diode, continuity, ohm, hz, V alert and live wire. With this smart digital voltmeter, you can solve industrial, vehicle and household electrical problems, etc. 5RECOGNITION AND INDICATION: Digital multimeter support neutral wire and live wire recognition, live line analog bar full grid, buzzer sound, zero line without, and no red backlight Item Type: Digital Multimeter Material: ABS Model: A50 Screen Display: Normal with backlight Backlight Function: Long press backlight key to turn on Power Supply: 1 x 700mAh Lithium ion battery(built in) DC Current: 1-610mA AC Current: 1-610mA Frequency: 0-9999Hz Resistance: 0.1-60M Conduct Buzzer(