Voltage measurement range: DC0.000~100.0V Error 1.00V 0.1V Current measurement range: 0.000A~10.00A Error 0.1A 0.03A Power metering range: 0.000~1000WBright screen off function: support, only control the digital tube, does not affect the circuit on and offVoltage and current display fine-tuning, over-voltage and over-current Audible alarmProduct Name: BM730-10A Voltage, Current and Power Meter with Sound AlarmOperating Voltage: DC7~30V (Do not over-voltage power supply)Voltage Measurement Range: DC0.000~100.0V Error 1.00V 0.1V Current Measurement Range: 0.000A~10.00A Error 0.1A 0.03A Power Measurement Range: 0.000~1000WWorking energy consumption: about 20mAVoltage display trimming: support, 0.1V stepCurrent display trimming: support, 0.1A stepLow-voltage audible alarm: support, 0.1V~99.9VHigh-voltage audible alarm: support, 0.1V~100.0VOvercurrent audible alarm: support, 0.1A~10.00AScreen on screen and screen off function: support. Only control the digital tube, does not affect the circuit on and off.Product size: 79.3x42.1x26.2mmInstallation aperture: 71.7x39.1mmColor: GrayMaterial: plasticPackage Contents:1 set * Voltage and current meterOnly 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.