REARMASTER OBD Power Cable for Dash Camera USB

REARMASTER Universal OBD Power Cable provides a clean USB power feed from your vehicle's OBD-II port so your dash camera can run in ACC mode or continuous 24-hour surveillance with low-voltage protection.

This compact OBD-to-USB power cable replaces the cigarette-lighter lead and gives dash cameras, GPS units, and other USB devices a direct, reliable power source. With two selectable modes — ACC (automatic cut-off after five minutes) and Surveillance (continuous power until the car battery drops to 11.6V) — it balances parked recording needs with battery protection. The 3.5 m (11.5 ft) extension and 5V/2.1A output make installation flexible and compatible with most USB dashcams.

How do the two working modes differ and when should I use each?

The cable offers an ACC mode and a Surveillance mode selectable with a built-in switch. ACC mode turns the camera off about five minutes after ignition off, suitable for everyday parking where long recordings aren't necessary. Surveillance mode keeps your camera recording while parked until the battery drops to the safe cutoff (11.6V), ideal for 24-hour monitoring but requiring attention to battery drain.

• Mode O (ACC): powers off ~5 minutes after ignition off.
• Mode — (Surveillance): continues until vehicle voltage hits 11.6V, then shuts off after 30 seconds.
• Low-voltage cutoff prevents excessive battery depletion.
• Tip: switch to ACC for long periods of inactivity to preserve battery.

Will this cable fit my dash camera and car?

The cable uses the vehicle’s OBD-II port for power and provides a USB output (5V/2.1A), making it compatible with most USB-powered dash cameras and accessories. It draws only power from the OBD interface and does not alter OBD data. However, some dash cams and models have reported incompatibilities; check the product's known incompatible list before buying.

• Universal USB output works with most dash cams, phones, GPS units and power banks.
• 3.5 m (11.5 ft) cable length for flexible routing behind trim panels.
• Does not interfere with OBD data communication.
• Review the incompatible brands list (e.g., certain Viofo, Garmin, 70mai models) before purchase.

How do I install and troubleshoot the REARMASTER OBD cable?

Installation is straightforward: plug the cable into your vehicle’s OBD-II port and route the USB end to your dash camera. If a vehicle doesn't switch modes correctly, unplug the cable, plug it back into the OBD port, then restart the car. For dashcams with proprietary power systems, verify compatibility before connecting.

• Simple plug-and-play: insert into OBD-II port and connect USB to dash cam.
• If modes don’t switch: unplug, reinsert, and restart vehicle.
• Confirm dash cam power behavior — some models may be incompatible.
• Recommended to set ACC mode if vehicle will be unused for many days.

What safety and performance specs should I know?

The cable supports ACC input 13V–36V and surveillance input 11.6V–36V, delivering a stable 5V/2.1A USB output suitable for most dash cams. The built-in low-voltage protection helps ensure you retain enough charge to start the car. The unit is designed to free the cigarette lighter socket while powering devices directly from the OBD port.

• Input ranges: ACC 13V–36V; Surveillance 11.6V–36V.
• Output: USB 5V/2.1A for cameras and small USB devices.
• 3.5 m extension cable for flexible placement and neat routing.
• Protects vehicle battery by cutting off at 11.6V in surveillance mode.

Who is this for? The REARMASTER OBD power cable is designed for drivers who want a tidy, reliable way to power dash cameras without using the cigarette-lighter socket — especially people who need parked surveillance or longer runtime than the lighter socket provides. Choose it if you want selectable ACC/Surveillance modes, a long routing cable, and straightforward OBD installation; avoid it if your dash cam is listed as incompatible or uses a proprietary power method.