3.3V or 5V power supply, wideband voltage input range: 2.5V~5.5V
Reference voltage: 1.185V (10ppm/℃)
The typical operating current in full operation: 5.5mA
Sleep mode (the typical operating mode): 10uA
4 independent oversampling ∑-∆ ADCs: one voltage, two current, and 1 multi-functional channel. 
Various measurements
-  Raw waveforms and DC components of voltage/ current signals
-  Instantaneous/ active/ reactive power average in sec and apparent power average in sec
-  Instantaneous/voltage/ current average in sec RMS 
-   Active/reactive energy power are selectable 
High performance 8-bit 8052 MCU core with programmable operation 
High performance RTC, support temperature sensor 
Highly metering accuracy
-  Less than 0.1% error in active energy metering over a dynamic range of 5000:1. 
-  Less than 0.1% error in reactive energy metering over a dynamic range of 3000:1. 
-  Less than 0.5% error in voltage/ current RMS metering over a dynamic range of 1000:1.