1. Voltage alarm function (over voltage alarm threshold, backlight and voltage flashing to alarm). 2. The reset function of energy key. 3. Store data when power off. 4. Backlight function. Display format:1.Power:test range:0-10kW;Within 1KW,the display format is 0.0-999.9W;1KW and above,the display format is 1000-9999W.2.Energy:test range:0-9999kWh;Within 10KWh,the display format is 0-9999Wh;10kWh and above,the display format is 10-9999kWh. 3.Voltage:test range:6.5-100V;Display format:6.50-99.99V 4.Current:test range:0-100A(0-20A);Display format:0.00-99.99 1.Reset energy Step1:Long the key until the power display area display "",then release the key. Step2:At this moment,the energy is flashing to prompt this is the energy reset state,if short the key again,then the energy value is cleared and exit the reset flashing state. Step 3:If there is no operation within 5 seconds,it means the energy value is not cleared and exit the reset state. 2.Set voltage alarm threshold Step1:Long 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 to plus 1,when there is no operation over 3 seconds,it 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 finish the setting,long the key until the screen display "PASS" ,that means you set successfully and exit the setting state automatically. Colour:Black Material:plastic Package Contents: 1 * DC meter 1 * current shunt Only the above package content, other products are not included. Note: Light reflection 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.