1. Current, voltage, power, power, capacity, capacity, resistance, timing time, capacity group number, Celsius, Fahrenheit, quick recognition, and many other parameters, a screen display of a of parameters. 2. It can detect the charging status of the electrical appliances in real-time, and monitor the charging voltage and current in real-time and other parameters information at a glance. 3. Display on/off function: through the multifunctional key short press switch interface to the rest screen interface for the off display, but also can be normal to the device charging night charging. 4. easy to test a of chargers, data cables, rechargeable batteries, , cell phones, and so on. 5. A of fast charging protocols automatically detect, fast charging recognition detection covers almost all fast charging protocols, and can meet the needs of all types of cell phone users. Voltage measurement range: DC 4.5-36V Current measurement range: 0-5A/0-8A Capacity totalization range: 0-99999mAh Power Accumulation Range: 0-99999mWh Power measurement range: 0-150W Impedance measurement range: 1-999.9ohm Temperature measurement range: 0-80 Operating Temperature: -10-60 Working humidity: 10-80%RH (no condensation) Working air pressure: 80-106kPa Multi-function button operation instructions: Short press mode button 1. is to switch the screen 2. Quickly triple-tap the switch button to reset the power to zero (mWh) and the timing reset to zero the current group (0.00) 3. Long press the on/off button for 2 seconds to change the accumulated data storage group number (NO.X). Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:As Shown Material:ABS Package Contents: 1 x volt-ammeter(USB) 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.