1. The signal generator is small in size, has many functions, easy to operate and easy to carry.2. The key layout is reasonable, all functions have independent corresponding keys, easy to operate.3. Built-in battery, low power consumption, long standby time.LCD Display Digital Voltage Multimeter 6 In 1 AC 110V-250V 20A Current-Energy Meter Ammeter Voltmeter With Backlight Good stability and high precision-this intelligent performance monitor uses a special built-in chip. Full screen displays the effective value of voltage, effective value of current, active power, accumulated power, grid frequency, power factor, and can be used in civil and industrial fields. Energy 5 digits, 0.01 to 99999 kWh. Compatible frequency 50/60 Hz.Backlight control, short press to turn on/off the backlight. To delete the electric energy meter, press and hold the button to delete the kWh display.Six main functions are displayed in full screen. The backlight flashes to warn of overload. When the current power is less than the overload power, the alarm stops.During normal operation, P06S-100 must be connected to an external transformer. When threading, you must follow the arrow of mutual inductance! No current or power factor after running indicates a wiring error.Short press the button to switch the backlight on and off.Long press for 3 seconds to enter the overload power setting.Enter the overload power setting, the factory default value is 4.4KWThe high position flashes, the value corresponding to the short press of the button increases by 1, and the long press for 2 seconds is shifting, and it can be set to 99.9KWWithout any key operation, exit after 5 seconds and save the data.Long press for 5 seconds, the system resets, the accumulated power is cleared, and the overload power setting returns to the default value.Material:plasticcolour:BlackPackage Contents:1 * 20A 4400W VoltmeterOnly the above pack