Product description:Input voltage: DC5VOperating voltage: 30mA .Transistor tester controlThe tester is controlled by a encoder switch.Color: Blackmaterial: plasticThe encoder switch can have a of 6 operations, short press, long press, left turn, right turn, press and hold left turn, press and hold right turn.A short press in the off state will turn on the power and the test.After a test is completed, if no device is detected. Long press the switch or rotate the switch left or right to enter the function . After entering the function , the left or right switch can select up or down the item, and to enter a certain function item, press the switch once short. When it is necessary to exit from a certain function, then long press the switch.Package Contents:1 x GM328A Transistor TesterOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.