Intuitive Electric Usage Monitoring Measure power (W), volts, amps, frequency, power factor, max/min power (W), cumulative time, and energy (kWh); automatically calculate costs based on set prices; track home energy usage for efficient electricity savings. 90-250V Wide Voltage Range Measures 90V-250Vac, 0-16AMP, 0-3680Watt, with overload indication adjustable from 680 to 3680W; adheres to Class 1.0 accuracy standard with 0.1W, 0.1V, 0.001A, and 0.001kWh resolution. Clear LCD Display with Backlight Features a wide-angle, clear-digit LCD display with backlight for easy reading and operation in dark environments. 90 Days Long-Term Data Hold Memory Equipped with built-in rechargeable battery backup, storing data for up to 90 days during power outages or when unplugged; reset button restores all data to zero. Space-Saving Design Compact size leaves lower wall outlet accessible when plugged into the upper outlet; made of high-quality fire-resistant material.