Why when we purchase from your company, the test can reach more than 20 meters with your company's mahogany wireless remote control, but after I installed it here, the remote control can't be opened up to the 4th floor?

Hello, FCL-918E series integrated lock uses microwave wireless communication code matching technology (like many car remote controls), which can exceed 20 meters in a straight line, but the signal will be greatly reduced after passing through the wall.

A weak signal on the FCL-918E circuit will fail the verification and the door cannot be opened remotely. If you want to have a longer communication distance, it is recommended to replace a wireless remote control with a larger transmitting power. Or when opening the door remotely, please try to face the FCL-918 electric lock as much as possible, this will have a much better effect.