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: 0.000~1000W Bright screen off function: support, only control the digital tube, does not affect the circuit on and off Voltage and current display fine-tuning, over-voltage and over-current Audible alarm Product Name: BM730-10A Voltage, Current and Power Meter with Sound Alarm Operating 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: 0.000~1000W Working energy consumption: about 20mA Voltage display trimming: support, 0.1V step Current display trimming: support, 0.1A step Low-voltage audible alarm: support, 0.1V~99.9V High-voltage audible alarm: support, 0.1V~100.0V Overcurrent audible alarm: support, 0.1A~10.00A Screen on screen and screen off function: support. Only control the digital tube, does not affect the circuit on and off. Product size: 79.3x42.1x26.2mm Installation aperture: 71.7x39.1mm Color: Gray Material: plastic Package Contents: 1 set * Voltage and current meter 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.