This is a cost-effective and widely used transistor detector. You can use it to detect NPN and PNP transistor, capacitor, resistor, diode, double diode, zener diode, N-channel and P-channel MOSFET, triac and battery etc. Features: It can be widely used to detect NPN and PNP transistor, capacitor, resistor, diode, double diode, N-channel and P-channel MOSFET, IGBT, JFET, triac and battery etc. It also can detect zener diode and has the function of self-calibration. After detection, align the infrared remote control with the "IR" light, then press the button in the remote control, if the detector successfully decode it, it will display the data code and infrared wave form. One button operation, automatically detect and shutdown, and you can press the multi-functional button to close the detector too. Put the pins of component in corresponding area, then dial the little handle and the detector will test it automatically, finally the results will display on the back light LCD screen clearly. Not like the usual black and white display, this detector will show results in color. Specifications: Type: Lithium battery version / Dry battery version (Optional) Power Supply: Lithium Battery Version: 3.7V 250mAh Lithium battery Dry Battery Version: 2 * AAA batteries (not included) Material: ABS Display: Large Graphic LCD Screen Diode Range: Forward voltage