Features: AC Multifunction Power Meter : Electric parameters measurement function : Voltage Current Energy Power Working Time Overload alarm function : More than power alarm threshold backlight flashing alarm Power alarm threshold preset functions : Can set power alarm threshold Electricity operation time key reset function Backlight Power down data storage function : Keep off before the electric powertotal operation timedisplay itemsback light out state Specifications: Voltage Measuring Range : AC 80 - 264V Current Measuring Range : 20A (The Current range can be increases up to 50A by use of heavier gage wire.) Energy Measuring Range : 0-9999.99KWh Power Measuring Range : 0 - 9000W Working Time : 0 - 9999.59hours Net weight: 49.6g Package Contents : 1 x LCD Digital Voltage Current Meter