Features: 1. Perforated, isolated, and non-destructive measurements. 2. Positive and negative bidirectional current measurement. 3. Integrated voltage and current, anti reverse connection protection, anti reverse connection without burning. 4. Efficient and stable performance, long working life. 5. Small size, simple and convenient to use, with a wide range of applications. Specifications: Current range: 400A Current resolution: 0.1A Current error: ±1% Power supply voltage range: DC5-100V Voltage measurement input range: DC0-300V Voltage resolution: 0.1V Voltage error: ±1% Installation slot size: 45.5 x 26mm Sensor perforation diameter: 20mm Header size: 48 x 29 x 23mm Material: ABS colour: Black Package Contents: 1 x Ampere voltmeter 1 x Diverter 1 x Connection cable 1 cord 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.