China's radio transmission tower is located in Shangqiu, Henan Province, with the launch pad as the center, covering a radius of 1 1,000 km (ground wave) and 2500km (sky wave). The effect of signal reception will depend on time, season, climate and surrounding environment (whether there are radio wave obstacles-whether there are cement buildings surrounded by high-rise buildings and basements). ); Whether there is an environment where interference occurs-such as TV, computer, etc. You can try the reception effect in the open space or on the table by the window. If you still can't receive the radio signal despite the above reasons, it is recommended that you contact Casio after-sales service.

Casio GW-4000 is a radio watch.