What is the small button at the back of the ETC device?

[Bailey]

The switch at the back of the ETC device is an anti-removal activation switch. Since the ETC device has an anti-tamper function, once it is peeled off from the windshield, the internal switch will automatically deactivate. If the device is removed and activated, the vehicle owner must bring the vehicle registration certificate to the ETC service provider for reactivation. ETC charging principle: There will be one or more ETC lanes on highways. Through dedicated short-range microwave communication between the on-board electronic tag installed on the vehicle's windshield and the microwave antenna in the ETC lane at the toll station, the system uses computer networking technology to perform backend settlement with the bank, achieving the goal of paying tolls without stopping at the toll booth. All of this is based on the principle of passing first and deducting fees later. Benefits of installing ETC: Time-saving: Eliminates the hassle of waiting in line. Green and eco-friendly: Promotes low-carbon travel by reducing noise and exhaust emissions since vehicles do not need to stop at toll booths. Reduced wear and tear: Saves costs by minimizing frequent starts and brakes, thereby reducing vehicle wear and fuel consumption. Improved efficiency: Theoretically, ETC lanes can improve vehicle passing efficiency by 2-3 times, making traditional ETC faster, more advanced, and high-tech. Compared to license plate payment, ETC technology is more mature and advantageous. More policy support: The State Council clearly stated in the "13th Five-Year Plan for the Development of a Modern Comprehensive Transportation System" that "by 2020, the interoperability of transportation cards in key city clusters will be basically achieved, and the proportion of vehicles equipped with ETC will significantly increase." It also set a target in the "13th Five-Year Plan" for comprehensive transportation development: "By 2020, the ETC usage rate for road passenger vehicles should reach 50%." More future possibilities: In addition to continuously improving the convenience of ETC installation and usage rates for passenger vehicles, the future will also promote ETC usage for trucks and explore deep integration between the ETC system and smart transportation developments such as vehicle-to-vehicle communication and vehicle-road coordination. This will provide comprehensive travel services for vehicle owners, meaning more application scenarios will support ETC usage. Precautions for installing ETC: Do not obstruct the driver's view; it is best to install it behind the rearview mirror: Many car models have windshields with a steep rearward angle, which can reduce the driver's field of vision. If this is not considered during ETC installation, it may increase blind spots for the driver. Installing it behind the rearview mirror on the right side avoids obstructing the view. Avoid interference with charging: The ETC electronic tag requires power but generally does not need charging or battery replacement, as it has a solar panel on the back for self-charging. Therefore, during installation, avoid the blackened areas of the windshield and positions that might block the solar panel. Do not remove it once installed: The button in the middle of the adhesive is an anti-removal lever connected to a switch. Once the electronic tag is installed on the windshield, the lever is pressed in. If removed, the lever will pop out and trigger the switch, locking the electronic tag and rendering it unusable. The owner will then need to visit an ETC service point to unlock it. This mechanism is designed to prevent multiple vehicles from sharing one device. Notes for using ETC: The ETC transaction sensing range is 8 meters. To avoid paying for the vehicle in front due to its ETC device malfunction, maintain a distance of at least 10 meters. The ETC lane recognition speed is 20 km/h; exceeding this speed may result in failed fee deductions due to inability to read the device. When using a debit card linked to ETC, insufficient balance may also cause deduction failures.