There are 4 standard, 300V with built-in CT /300V with external CT/450V with built-in CT/450V with external CT pick your own. Voltage: 40-300V/250-450V, Current: 0-100A, Active Power: 0-30000W, Electric Energy: 0-99999kWh, Frequency: 45-65Hz, Power Factor: 0-1PF. Package Includes:1X Energy Meter ModelH66TG0344UJ487767 Specifications:Material: ABSSize: 54x80x64mm/2.1x3.15x2.5in Style: (optional) 300V A:300V built in transf; 300V B:300V external transf; 450V A:450V built in transf; 450V B:450V external transf AC voltage: AC 80.0-300.0V / 300.0-450.0V (depends on the range you choose) AC current: AC 0-99.99A, minimum resolution is 0.01A Power frequency: 45.0Hz-65.0Hz Power factor: 0.00-1.00PF Active power: 0-45000W when the active power between 0 and 9999.9W, the display accuracy is 0.1W Colorful LCD display, with backlight function, this single phase energy meter is clearly visible whatever day or night.This home electricity usage monitor features high quality ABS flame resistant material and high percision chip, making it safe to use with high precision. This Kwh meter is easy to install and can be used indoor or outdoor. Widely used in home, school, market, industry, laboratory, etc. Electric energy: 0-999999kwh, when the electric power between 0 and 999.99kwh, the display accuracy is 0.01kwh, when between 10000.0-9999.9kwh, the display accuracy is 0.1kwh, when between 10000.0 and 999999kwh, the display accuray is 1kwh. Speed: 2 times per secondInstallation Size: 35mm Din Rail mounting Note:Please allow 1-3cm error due to manual measurement.Due to the difference between different monitors, the picture may not reflect the actual color of the item.