Citizen CB1 Series Instruction Manual page 21

Approximate receivable area
The distance of receivable range is only used as an approximate value. It is often
affected by the receiving environment and weather.
JJY
(Japan):
Approx. 1000 km
Kyushu station
Notes on the time signal reception
JJY
Approx. 1000 km
Fukushima station
Continued on the next page
(Japan):
19