USB multifunction testerClick the button once to view the W Wh , while long pressing the button for 5 seconds to remove timing and Wh stored data, and click the button to enter the digital delay setting, however once again hit every single plus 30 minutes long pressing for 5 seconds to save set.Digital display, Mini size, portable, USB portsSpecifications:Voltage: DC 4-30VCurrent: 0-5ATime: 0-99 hoursPower: 0-150WCable length: 148mmMaterial: plasticcolour: As shownPackage Contents:1 x USB multifunction testerOnly 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.