How does mode "O" work when it's pins are 2 ground, and always on?

i believe the signal ground turns off when the ignition is turned off. so essentially it's shutting off the ground side of circuit not the power side to shut off the device.

how long is the cable?

Dear friend, Happy New Year. It is 3.5meter (11.5 ft).

Do you have to turn the switch to (Surveillance mode Input) when you turn off the car?

Dear friend, Thank you for your question, Whatever you turn off the car or not, if you want to make your dash cam get in surveillance mode, you could turn the switch to Surveillance mode Input. This has nothing to do with whether the car is turned off. You can switch directly according to your needs. Wish my answer will be helpful for you. Life is good, the best wishes to you. Mina

ASIN	B0BZYN7MQT
Best Sellers Rank	#746,800 in Electronics ( See Top 100 in Electronics ) #757 in Car On-Dash Video
Box Contents	User Manual
Brand	ssontong
Brand Name	ssontong
Colour	Black Dash Cam OBD Power
Compatible Devices	Camera
Connector Type	USB Type C
Current Rating	3 Amps
Customer Reviews	4.3 out of 5 stars 217 Reviews
Input Voltage	36 Volts
Item Dimensions	11 x 1 x 8 Centimeters
Item Package Quantity	1
Item Type Name	Type-C OBD Power Cable
Item Weight Unit of Measure	0.1 Kilograms
Item dimensions L x W x H	11 x 1 x 8 Centimeters
Manufacturer	ssontong
Model Number	5d1c720e-ad44-4d8a-8bfd-60bd7298f289
Nominal Power	15 Watts
Number of Items	1
Number of Ports	1
Power Plug Type	No Plug
Product Finish Type	Matte
Specific Uses For Product	Camera
Unit Count	1.0 Count
Warranty Type	Limited

ssontong Upgraded OBD2 OBD Power Cable for Dash Camera, OBD to Type-C USB OBDII Adapter Hardwire Charger Cable 24 Hours Surveillance and Acc Two Mode with Switch Button (Type-C USB Port)

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