Product Features:Collect single-phase two-channel AC parameters measurement:Adopt special measuring chip and effective value measurement Type:SINGLE-phase 2 Channel electric meter module Operating Temperature:Minus 20 degrees Celsius Positive seventy degrees Accuracy Class:1.0 Measuring Voltage Range:0-264V Measuring Current Range:20mA-60A :ELECTRICAL communication interface:1-way TTL Communication Protocol:Modbus-RTU High isolation voltage:Withstand voltage up to DC3000V Measurement accuracy:Voltage, current, power, electric quantity: less than 1.0%; power supply:DC single power supply 5V, power consumption 10mA Relative humidity:5 - 95%, no condensation (at 40) altitude:0-3000m way to install:PCB welding Colour:Green & Black Material:PCB+ electronic components Package Contents: 1 * energy metering module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.