Features: Plug and use, super convenient. Small and compact, lightweight, easy to carry with. Suitable for various mobile phones, mobile power supplies, tablets and other USB devices. The USB dual meter compact and can automatically convert and display USB charging voltage and current. High precise, stable and reliable performances, strong anti-interference ability, high temperature resistant. Specifications: Material: Plastics Supply Voltage/Test Voltage: DC3.2V-DC10V Test Current: 0~3A Working Current: Less Than 20mA Measurement Rate:=300mS Measurement Accuracy: 1%(2 Word) Operating Temperature: - 20 to 85 Working Humidity: 10~80% (no condensation) Size: Approx. 2.4x6.7cm/0.94x2.64in Color: Blue/Black Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Voltmeter Ammeter