To provide a radio-controlled clock capable of attaining power saving by elongating a battery lifetime as long as possible, when using a battery as a power source.
It is determined whether a detected voltage value V of the battery is below a prescribed voltage value V1 or not (S2). When the detected voltage value V is not below the prescribed voltage value V1 as a result of determination, a receiving period for receiving a standard radio wave intermittently by a receiving circuit is set at T1 (S3), and the receiving circuit performs intermittent reception of the standard radio wave with the receiving period T1 (S4). Also, when the detected voltage value V is below the prescribed voltage value V1, the receiving period is set at T2 (T1<T2) (S5), and the receiving circuit performs intermittent reception of the standard radio wave with the receiving period T2 (S6).
Yoshiaki Naito
Cui Shu Tetsu