What does the card power switch high frequency mean?

The plug-in card power switch is called a power switch, a power-saving switch, or an energy-saving switch. Mainly used in hotels and guesthouses. Solve the problem of cutting off the power supply of the room when the room is vacant, so as to achieve electricity safety and energy saving. The sensing distance of high-frequency cards is longer, while that of low-frequency cards is closer. The two radiation distances are different. For example, the high-frequency ones are used in parking lots. You don’t need to take them out to swipe, and the car will open before it reaches the door. Depending on the frequency and distance, there are high and low frequencies. High-frequency cards have a longer sensing range. For example, ultra-high-frequency cards used in parking garages can automatically open the door before the car reaches the door.