Main Function:Measure and LCD display AC Power Voltage, Current, Active Power, Energy kWh . Other Function: 1.Backlight control: The backlight can be turned on or off by short the key, 2.Reset energy: Long the key over 3 seconds until the energy data flash, then release the key, short the key again to reset the energy, otherwise after 3 seconds it stop flashing and the energy not be 3.Data Storage: When the power off, the energy data and backlight status can be saved. Colour:As Shown Material:plastic Parameters: 1.Voltage Measurement range: AC50~300V Starting test voltage: 50V Accuracy: ±1% 2.Current Measurement range:0~100A Display format: Less than 10A display such as:9.99A Less than 100A display such as:99.9A Starting test current:0.02A Accuracy: ±1% 3.Active Power Measurement range:0~30kW Display format: Less than 10W display such as:9.99W Less than 100W display such as:99.9W Less than 1000W display such as:999W Less than 10000W display such as:9.99kW equal 10000W display such as:30.0kW Starting test power:0.5W Accuracy: ±1% 4.Energy Measurement range:0~1999kWh Display format: Less than 10kWhdisplay such as:9.99kWh Less than 100kWhdisplay such as:99.9kWh Less than 1000kWhdisplay such as:999kWh Less than 10000kWh display such as:1999kWh Over the test range maintain the data, otherwise you reset it. Accuracy: ±1% Package Contents: 1 x 4IN1 Din Rail AC Monitor 1 x English manual 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.