ON or OFF: Single click to turn on single short press to switch modes, long press for 2 seconds to turn off If no data is displayed, please check whether the pin definition connection is correct. Or if there is a contact, or the current mode does not match If the screen shows "Low Battery", please replace the battery If there is no operation within 3 minutes, the host will automatically shut down. CAN mode: Connect the test lead probe to the CAN or pin and the baud rate will be displayed on the screen. After 2-3s, real-time data will be displayed (CAN mode automatically recognizes CAN or ) mode: Connect the red test lead probe to the pin. Connect the black test lead probe to the GND pin ( mode must be connected according to the pin definition) Power supply mode: 9V battery Supported baud rate range: mode: 2400- 4800 -9600-14400-19200bps CAN mode: 100-125-150-200-250-300-400-500-666 800-1000kbps Material: plastic colour: black Package Contents: 1 x Digital measuring instrument 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.