Built in Battery: the power consumption meter keeps its data and puts up to 3 months as long as the battery is fully when a power failure occurs. Safe Material The current meter is made of premium abs, heat and corrosion resistant, safe and fireproof, strong and durable, can be sued for long time. Energy and : the power consumption can more accurately monitor the consumption of household appliances and help you reduce electricity bills. Specification: Product Name: Current Meter Plug Standard: European Dimensions: 127 x 6 x 73.3 mm / 5 x 0.24 x 2.89 inches. Measurement of current accuracy: +/- 2%. Measurement accuracy: +/- 2%. Battery: 3.6V Ni- battery Power supply: 230V AC 50Hz Maximum load: 16a, 3680w Current: 0.0a-16.0a. Plug Type:EU Plug,it applies to Indonesia, Germany, France, , Italy and so on. Material: ABS colour: White Voltage: AC100-240V Package Contents: 2 Monitors 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.