Features: Self-recovery energy meter with voltage current display. Voltage: 140-300V, Hz: 50/60HZ,max-current: 40A, 63A. Made- of high strength fire retardant material, high durability and security. It has compact- size and simple construction-, easy to operate. Suitable for household or industrial. Specifications: Material: plastic Size: approx 8.5x3.6cm/3.3x1.4-inch Over- voltage:230V-300Vadjustable(default270V) Under- voltage:140-210Vadjustable(default170V) Over current:1A-63Aadjustable(default63A) Delay on time-:15-500sadjustable(default30s) Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xElectricity Usage Monitor