1. Backlight control - The backlight can be turned on or off by short press the key 2. Reset energy - Long press the key over 3 seconds until the energy data flash, then release the key, short press the key again to reset the energy, otherwise after 3 seconds it will stop flashing and the energy will not be reset. 3. Data Storage When the power off, the energy data and backlight status can be saved. 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 greater than equal 10000W display such as:30.0kW Starting test power:0.5W Accuracy: ±1% 4.Energy Measurement range:0-1999kWh Display format: Less than 10kWh display such as:9.99kWh Less than 100kWh display such as:99.9kWh Less than 1000kWh display such as:999kWh Less than 10000kWh display such as:1999kWh Over the test range will maintain the data, otherwise you reset it. Accuracy: ±1% Note:The colors of some accessories are random, and the designation is not accepted, which will not affect the use. Colour:White Material:Plastic Package Contents: 1 * AC Din Rail meter 1 * Power cable 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.