Note: you must install a counter-inductor for normal operation. The wiring direction must align with the arrow on the counter-inductor. Energy counter - with overload alarm. if the power is lower than the overload power, the alarm will be reset. Power meter - with backlight; the display is easy to read at night or in environments with poor light. It functions as a voltage meter and a wattmeter. Meter - made with flame-retardant material; safe to use as an energy counter. Use cases: - Home electrical panel monitoring to track voltage and power and to flag overload conditions. - Solar, battery charging, or DC/AC power setups where monitoring energy usage and preventing overload is important. - Electronics projects or workshop wiring where a readable, backlit wattmeter and energy counter aids debugging and optimization.