and High Quality 1. Electrical parameter measurement function (voltage, current, active power, energy) 2. Voltage alarm function (over voltage alarm threshold, backlight and voltage flashing to alarm). 3. Large-screen LCD (display voltage, current, active power, energy at the same time) 4. the backlight has memory function, it can store the on or off state when power off Set voltage alarm threshold: Step1: Long press the key until the power display area display ""SET"", then release the key. Step2: After enter this state, the voltage area display the current high voltage alarm value, the current area display the current low voltage alarm value and the last digit begin to flash, then you can short press to plus 1, when there is no operation over 3 seconds, it will switch the digit position automatically, from the high voltage alarm value to the low voltage alarm value, there are total six digits, the range of the voltage alarm threshold is 6.5~99.9V; Step3: After the setting, long press the key until the screen display "PASS",that means you set successfully and will exit the setting state automatically. Function: 1. It can display voltage, current, power, energy parameters at the same time. 2. Display format: 6.50~99.99V Current: test range: 0~20A Display format: 0.00~20.00 3. Display format Power: test range: 0~2k Within 1KW, the display format is 0.0~999.9W; 1KW and above, the display format is 1000~2000W Type: Digital Voltage Meter Size: 89.6mm Color: Black Material: plastic Package Contents: 1pc * Digital Voltage Meter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.