The actual object is 80 x 50 x 20 mm (excluding protruding parts such as mounting ears and connectors) This noise signal generator uses a special voltage regulator diode to generate white noise in the breakdown state and then amplify the output. It can be used as a spectrum tracking source and interference source. This product does not include a power adapter. The power socket has an outer diameter of 5.5 mm and an inner diameter of 2.1 mm. Because there are too many types of power adapters now, the quality of low-priced products is really difficult to , and I really don't want to give you something that I can't . So we no longer equip the product with a power adapter, but will equip it with a screw-type adapter for your convenience. Power supply voltage: +12V Due to the high price of network analyzers, it is relatively not as easy to obtain as spectrum analyzers. This baby just solves this problem. It can directly measure the S21 parameters of passive products, and can also measure standing wave parameters by connecting a standing wave bridge. It is a powerful tool for the development and measurement of RF enthusiasts. Colour:silver Material:ABS Package Contents: 1 * RF Noise Signal Generator 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.