the module is mainly used for measuring AC voltage, current, active power, frequency, power factor and active energy, the module is without display function, the data is read through the TTL interface. PZEM-004T-10A:Measuring Range 10A (Built-in Shunt) Different batches may result in different product appearances, text, and colors, which do not affect usage 1. Voltage Measuring range:80-260V Resolution:0.1V Measurement accuracy:0.5% 2. Current Measuring range:0-10A(PZEM-004T-10A) Starting measure current:0.01A(PZEM-004T-10A) Resolution:0.001A Measurement accuracy:0.5% 3. Active power Measuring range:0-2.3kW(PZEM-004T-10A) Starting measure power:0.4W Resolution:0.1W Display format: Less than 1000W, it display one decimal, such as:999.9W equal 1000W, it display only integer, such as:1000W Measurement accuracy:0.5% 4. Power factor Measuring range:0.00-1.00 Resolution:0.01 Measurement accuracy:1% 5. Frequency Measuring range:45Hz-65Hz Resolution:0.1Hz Measurement accuracy:0.5% 6. Active energy Measuring range:0-9999.99kWh Resolution:1Wh Measurement accuracy:0.5% Display format: Less than 10kWh, the display unit is Wh(1kWh=1000Wh), such as: 9999Wh equal 10kWh, the display unit is kWh, such as: 9999.99kWh Reset energy:use software to reset. 7. Over power alarm Active power threshold can be set, when the measured active power exceeds the threshold, it can alarm 8. Communication interface RS485 interface Colour:TransparentBlue Case Material:plastic Package Content: 1 * Meter 1 * TTL to USB Cable 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.