Battery power supply Merchandise dimensions (L x W x H) 0.71 x 4.61 x 2.83 inches Operating system [Easy to use] [Plug and Play] [One-button I/M Ready] The screen size is 2.4 inches About the commodity [Battery off] This AL319 automotive diagnostic tool supports reading DTC, displaying real-time data, freezing box and I/M ready, among other things, to determine the root cause of checking the engine light (CEL), helping you detect any potential problems, and avoiding unnecessary repair costs with excessive costs. Versatile Autel AL319 is compatible with 7 languages (English, French, Spanish, etc.) and a variety of post-1996 OBD II protocol vehicles (Toyota, Nissan, Honda, Ford, etc.). This OBD II scanner provides accurate and fast diagnostics for car owners worldwide. [For end users and Diyers] This error code reader AL319 is "plug and play" and comes with a simple interface. Even if you are not familiar with vehicle maintenance, you can quickly take control of this obd2 scanner and get the information you want. [User-friendly design] This check engine code reader features patented one-button I/M ready button, TFT color display, built-in speaker, LED indicator and more. The data cable is long enough not to be too long and not to get in the way. No battery required.